diff --git a/static/base.css b/static/base.css
index f2b59de..1843701 100644
--- a/static/base.css
+++ b/static/base.css
@@ -9,6 +9,7 @@
     --color-panel-border: rgba(0, 0, 0, 20%);
     --color-panel-background: #fff;
     --color-shaded-background: rgba(0, 0, 0, 5%);
+    --color-active-background: rgba(0, 0, 0, 10%);
 
     --dialog-backdrop: rgba(255, 255, 255, 0.5);
 
@@ -53,10 +54,28 @@ textarea {
 /* Buttons */
 
 button {
+    color: var(--color-text);
+
     border: 1px solid var(--color-panel-border);
     border-radius: 9999px;
     padding: 0.5rem 1.5rem;
-    background-color: var(--color-panel-background);
+    background: none;
+
+    &:hover:not(:disabled) {
+        background-color: var(--color-shaded-background);
+    }
+
+    &:active:not(:disabled) {
+        background-color: var(--color-active-background);
+    }
+
+    &:disabled {
+        opacity: 50%;
+    }
+}
+
+button.destructive {
+    color: var(--color-error);
 }
 
 button.icon {
diff --git a/static/brush-box.js b/static/brush-box.js
new file mode 100644
index 0000000..170e34c
--- /dev/null
+++ b/static/brush-box.js
@@ -0,0 +1,348 @@
+import { BrushPreview } from "rkgk/brush-preview.js";
+import { Haku } from "rkgk/haku.js";
+import { randomId } from "rkgk/random.js";
+import { SaveData } from "rkgk/framework.js";
+import { ContextMenu, globalContextMenuSpace } from "rkgk/context-menu.js";
+
+export const builtInPresets = [
+    {
+        id: "builtin/default",
+        name: "Default",
+        code: `
+-- Try playing around with the values
+-- and see what happens!
+color = #000
+thickness = 8
+
+withDotter \\d ->
+  stroke thickness color (line (d From) (d To))
+        `.trim(),
+    },
+
+    {
+        id: "builtin/thick",
+        name: "Thick",
+        code: `
+color = #000
+thickness = 48
+
+withDotter \\d ->
+  stroke thickness color (line (d From) (d To))
+        `.trim(),
+    },
+
+    {
+        id: "builtin/pencil",
+        name: "Pencil",
+        code: `
+color = #0003
+thickness = 6
+
+withDotter \\d ->
+  stroke thickness color (line (d From) (d To))
+        `.trim(),
+    },
+
+    {
+        id: "builtin/woobly",
+        name: "Woobly",
+        code: `
+color = #000
+minThickness = 8
+maxThickness = 20
+wavelength = 1
+
+withDotter \\d ->
+  let pi = 3.14159265
+  let a = (sin (d Num * wavelength / pi) + 1) / 2
+  let range = maxThickness - minThickness
+  let thickness = minThickness + a * range
+  stroke thickness color (line (d From) (d To))
+        `.trim(),
+    },
+
+    {
+        id: "builtin/wavy",
+        name: "Wavy",
+        code: `
+color = #000
+thickness = 4
+amplitude = 50
+wavelength = 1
+
+mag = \\v ->
+  hypot (vecX v) (vecY v)
+
+norm = \\u ->
+  let l = mag u
+  u / vec l l
+
+perpClockwise = \\v ->
+  vec (vecY v) (-(vecX v))
+
+withDotter \\d ->
+  let pi = 3.14159265
+  let a = sin (d Num * wavelength / pi) * amplitude
+  let direction = (d To) - (d From)
+  let clockwise = norm (perpClockwise direction) * vec a a
+  let from = d From + clockwise
+  let to = d To + clockwise
+  stroke thickness color (line from to)
+        `.trim(),
+    },
+
+    {
+        id: "builtin/rainbow",
+        name: "Rainbow",
+        code: `
+wavelength = 0.1
+thickness = 8
+
+colorCurve = \\n ->
+  abs (cos n)
+
+withDotter \\d ->
+  let pi = 3.14159265
+  let l = wavelength
+  let r = colorCurve (d Num * l)
+  let g = colorCurve (d Num * l + pi/3)
+  let b = colorCurve (d Num * l + 2*pi/3)
+  let color = rgba r g b 1
+  stroke thickness color (line (d From) (d To))
+        `.trim(),
+    },
+
+    // ...feel free to add more presets here!
+];
+
+function presetButton(info) {
+    let button = document.createElement("button");
+    let preview = button.appendChild(new BrushPreview(56, 56));
+    let label = button.appendChild(document.createElement("p"));
+    label.classList.add("label");
+    label.innerText = info.name;
+    return { button, preview };
+}
+
+export class BrushBox extends HTMLElement {
+    dirty = false;
+
+    saveData = new SaveData("brushBox");
+
+    connectedCallback() {
+        this.saveData.attachToElement(this);
+
+        this.classList.add("rkgk-panel");
+
+        this.brushes = [];
+
+        this.brushesContainer = this.appendChild(document.createElement("div"));
+        this.brushesContainer.classList.add("brushes");
+
+        this.userPresets = this.saveData.get("userPresets", []);
+
+        this.updateBrushes();
+
+        // NOTE: Restoring the currently selected brush from local storage must NOT end up in a
+        // code editor update, so as not to reset the user's currently WIP brush.
+        let savedCurrentBrush = this.saveData.get("currentBrush", "builtin/default");
+        if (this.findBrushPreset(savedCurrentBrush)) {
+            this.setCurrentBrush(savedCurrentBrush);
+        } else {
+            console.warn("brush preset does not exist", savedCurrentBrush);
+            this.setCurrentBrush("builtin/default");
+            this.#sendBrushChange(this.findBrushPreset(this.currentPresetId));
+        }
+    }
+
+    initialize(wallLimits) {
+        this.haku = new Haku(wallLimits);
+        this.renderBrushes();
+    }
+
+    updateBrushes() {
+        this.brushesContainer.replaceChildren();
+        this.brushes = [];
+
+        const addBrush = (preset, { mutable }) => {
+            let pb = presetButton(preset);
+            this.brushesContainer.appendChild(pb.button);
+            this.brushes.push({
+                preset,
+                presetButton: pb,
+            });
+
+            pb.button.addEventListener("click", (event) => {
+                if (this.dirty) {
+                    let confirmation = new ContextMenu();
+
+                    confirmation.addHtmlP(
+                        "<strong>Your brush has unsaved changes.</strong>" +
+                            "<br>Loading another brush will discard them." +
+                            "<br>Are you sure?",
+                    );
+                    confirmation.addSeparator();
+                    confirmation.addButton("Yes").addEventListener("click", () => {
+                        this.#sendBrushChange(preset);
+                    });
+                    confirmation.addHtmlP("Click anywhere else to cancel", {
+                        classList: ["small"],
+                    });
+
+                    globalContextMenuSpace.openAtCursor(event, confirmation);
+                } else {
+                    this.#sendBrushChange(preset);
+                }
+            });
+
+            pb.button.addEventListener("contextmenu", (event) => {
+                event.preventDefault();
+
+                let menu = new ContextMenu();
+
+                menu.addButton(this.currentPresetId == preset.id ? "Save" : "Overwrite", {
+                    disabled: !mutable,
+                    tooltip: mutable ? "" : "This is a built-in brush and cannot be modified",
+                }).addEventListener("click", () => {
+                    this.dispatchEvent(
+                        Object.assign(new Event(".overwritePreset"), {
+                            preset,
+                        }),
+                    );
+
+                    this.updateBrushes();
+                    this.renderBrushes();
+                    this.markClean();
+                    this.saveUserPresets();
+                });
+
+                menu.addButton("Duplicate").addEventListener("click", () => {
+                    let id = this.saveUserPreset(preset);
+                    this.updateBrushes();
+                    this.renderBrushes();
+
+                    if (!this.dirty) {
+                        this.currentPresetId = id;
+                        let duped = this.findBrushPreset(this.currentPresetId);
+                        this.#sendBrushChange(duped);
+                    }
+                });
+
+                menu.addButton("Delete", {
+                    classList: ["destructive"],
+                    disabled: !mutable,
+                    tooltip: mutable ? "" : "This is a built-in brush and cannot be deleted",
+                }).addEventListener("click", () => {
+                    // NOTE: This leaves the box in a weird state where there is no current brush.
+                    // That's okay; code should not assume there's a current preset ID.
+                    if (this.currentPresetId == preset.id) {
+                        this.currentPresetId = null;
+                        this.markDirty();
+                    }
+
+                    let index = this.userPresets.indexOf(preset);
+                    this.userPresets.splice(index, 1);
+
+                    this.updateBrushes();
+                    this.renderBrushes();
+                    this.saveUserPresets();
+                    // NOTE: No brush change because we don't want to overwrite the editor.
+                });
+
+                globalContextMenuSpace.openAtCursor(event, menu);
+            });
+        };
+
+        for (let preset of builtInPresets) addBrush(preset, { mutable: false });
+        for (let preset of this.userPresets) addBrush(preset, { mutable: true });
+
+        let saveButton = this.brushesContainer.appendChild(document.createElement("button"));
+        saveButton.classList.add("save-button");
+        let plusIcon = saveButton.appendChild(document.createElement("div"));
+        plusIcon.classList.add("icon", "icon-plus");
+        let saveLabel = saveButton.appendChild(document.createElement("p"));
+        saveLabel.classList.add("label");
+        saveLabel.innerText = "Save new";
+
+        saveButton.addEventListener("click", () => {
+            this.dispatchEvent(new Event(".clickNew"));
+        });
+
+        if (this.currentPresetId != null) this.setCurrentBrush(this.currentPresetId);
+    }
+
+    async renderBrushes() {
+        for (let brush of this.brushes) {
+            this.haku.setBrush(brush.preset.code);
+            await brush.presetButton.preview.renderBrush(this.haku);
+        }
+    }
+
+    setCurrentBrush(id) {
+        this.currentPresetId = id;
+        this.saveData.set("currentBrush", this.currentPresetId);
+
+        for (let brush of this.brushes) {
+            let button = brush.presetButton.button;
+            if (brush.preset.id != id) button.classList.remove("current");
+            else button.classList.add("current");
+        }
+    }
+
+    indexOfBrushPreset(id) {
+        for (let i in this.brushes) {
+            if (this.brushes[i].preset.id == id) return i;
+        }
+        return null;
+    }
+
+    findBrushPreset(id) {
+        let index = this.indexOfBrushPreset(id);
+        if (index == null) return null;
+        return this.brushes[index].preset;
+    }
+
+    markDirty() {
+        this.dirty = true;
+        this.classList.add("unsaved");
+    }
+
+    markClean() {
+        this.dirty = false;
+        this.classList.remove("unsaved");
+    }
+
+    saveUserPreset({ name, code }, id = null) {
+        if (id == null) {
+            // Save a new preset.
+            id = `user/${randomId()}`;
+            console.log("saving new brush", id);
+            this.userPresets.push({
+                id,
+                name,
+                code,
+            });
+        } else {
+            // Overwrite an existing one.
+            let preset = this.userPresets.find((p) => p.id == id);
+            console.log("overwriting existing brush", preset);
+            preset.code = code;
+        }
+        this.saveUserPresets();
+        return id;
+    }
+
+    saveUserPresets() {
+        this.saveData.set("userPresets", this.userPresets);
+    }
+
+    #sendBrushChange(preset) {
+        this.dispatchEvent(
+            Object.assign(new Event(".brushChange"), {
+                preset,
+            }),
+        );
+    }
+}
+
+customElements.define("rkgk-brush-box", BrushBox);
diff --git a/static/brush-editor.js b/static/brush-editor.js
index e88e3af..41fe576 100644
--- a/static/brush-editor.js
+++ b/static/brush-editor.js
@@ -1,15 +1,10 @@
 import { CodeEditor } from "rkgk/code-editor.js";
-
-const defaultBrush = `
--- This is your brush.
--- Try playing around with the numbers, 
--- and see what happens!
-
-withDotter \\d ->
-  stroke 8 #000 (d To)
-`.trim();
+import { SaveData } from "rkgk/framework.js";
+import { builtInPresets } from "rkgk/brush-box.js";
 
 export class BrushEditor extends HTMLElement {
+    saveData = new SaveData("brushEditor");
+
     constructor() {
         super();
     }
@@ -17,6 +12,25 @@ export class BrushEditor extends HTMLElement {
     connectedCallback() {
         this.classList.add("rkgk-panel");
 
+        this.saveData.attachToElement(this);
+
+        const defaultBrush = builtInPresets[0];
+
+        this.nameEditor = this.appendChild(document.createElement("input"));
+        this.nameEditor.value = this.saveData.get("name", defaultBrush.name);
+        this.nameEditor.classList.add("name");
+        this.nameEditor.addEventListener("input", () => {
+            this.saveData.set("name", this.nameEditor.value);
+
+            this.dispatchEvent(
+                Object.assign(
+                    new Event(".nameChanged", {
+                        newName: this.nameEditor.value,
+                    }),
+                ),
+            );
+        });
+
         this.codeEditor = this.appendChild(
             new CodeEditor([
                 {
@@ -25,9 +39,14 @@ export class BrushEditor extends HTMLElement {
                 },
             ]),
         );
-        this.codeEditor.setCode(localStorage.getItem("rkgk.brushEditor.code") ?? defaultBrush);
+        this.codeEditor.setCode(
+            // NOTE(localStorage): Migration from old storage key.
+            this.saveData.get("code") ??
+                localStorage.getItem("rkgk.brushEditor.code") ??
+                defaultBrush.code,
+        );
         this.codeEditor.addEventListener(".codeChanged", (event) => {
-            localStorage.setItem("rkgk.brushEditor.code", event.newCode);
+            this.saveData.set("code", event.newCode);
 
             this.dispatchEvent(
                 Object.assign(new Event(".codeChanged"), {
@@ -41,12 +60,28 @@ export class BrushEditor extends HTMLElement {
 
         this.errorArea = this.appendChild(document.createElement("pre"));
         this.errorArea.classList.add("errors");
+
+        // NOTE(localStorage): Migration from old storage key.
+        localStorage.removeItem("rkgk.brushEditor.code");
+    }
+
+    get name() {
+        return this.nameEditor.value;
+    }
+
+    setName(newName) {
+        this.nameEditor.value = newName;
+        this.saveData.set("name", this.nameEditor.value);
     }
 
     get code() {
         return this.codeEditor.code;
     }
 
+    setCode(newCode) {
+        this.codeEditor.setCode(newCode);
+    }
+
     resetErrors() {
         this.errorHeader.textContent = "";
         this.errorArea.textContent = "";
diff --git a/static/brush-preview.js b/static/brush-preview.js
index 6f550d2..1697415 100644
--- a/static/brush-preview.js
+++ b/static/brush-preview.js
@@ -1,19 +1,23 @@
 import { Pixmap } from "rkgk/haku.js";
 
 export class BrushPreview extends HTMLElement {
-    constructor() {
+    constructor(width, height) {
         super();
+
+        this.width = width;
+        this.height = height;
     }
 
     connectedCallback() {
         this.canvas = this.appendChild(document.createElement("canvas"));
         this.ctx = this.canvas.getContext("2d");
+
         this.#resizeCanvas();
     }
 
     #resizeCanvas() {
-        this.canvas.width = this.clientWidth;
-        this.canvas.height = this.clientHeight;
+        this.canvas.width = this.width ?? this.clientWidth;
+        this.canvas.height = this.height ?? this.clientHeight;
 
         if (this.pixmap != null) {
             this.pixmap.destroy();
@@ -51,6 +55,7 @@ export class BrushPreview extends HTMLElement {
         this.unsetErrorFlag();
         let result = await this.#renderBrushInner(haku);
         if (result.status == "error") {
+            console.error(result);
             this.setErrorFlag();
         }
         return result;
diff --git a/static/code-editor.js b/static/code-editor.js
index 431e0df..b0197f1 100644
--- a/static/code-editor.js
+++ b/static/code-editor.js
@@ -54,6 +54,10 @@ export class CodeEditor extends HTMLElement {
         return this.textArea.value;
     }
 
+    set code(newCode) {
+        this.textArea.value = newCode;
+    }
+
     #codeChanged() {
         this.#resizeTextArea();
         this.#renderLayers();
diff --git a/static/context-menu.js b/static/context-menu.js
new file mode 100644
index 0000000..546a6ec
--- /dev/null
+++ b/static/context-menu.js
@@ -0,0 +1,115 @@
+// - Create your context menu by instantiating ContextMenu and adding elements to it
+// - Open your menu in response to a contextmenu event by using globalContextMenuSpace.openAtCursor(event, menu)
+
+import { listen } from "rkgk/framework.js";
+
+export class ContextMenu extends HTMLElement {
+    connectedCallback() {
+        this.classList.add("rkgk-panel");
+
+        this.closeController = new AbortController();
+
+        this.hasMouse = false;
+        this.addEventListener("mouseover", () => (this.hasMouse = true));
+        this.addEventListener("mouseleave", () => (this.hasMouse = false));
+
+        window.addEventListener(
+            "mousedown",
+            () => {
+                if (!this.hasMouse) {
+                    this.close();
+                }
+            },
+            { signal: this.closeController.signal },
+        );
+
+        window.addEventListener(
+            "keydown",
+            (event) => {
+                if (event.key == "Escape") {
+                    this.close();
+                }
+            },
+            { signal: this.closeController.signal },
+        );
+    }
+
+    disconnectedCallback() {
+        this.closeController.abort();
+    }
+
+    close() {
+        this.space.close(this);
+    }
+
+    addButton(label, options) {
+        let { classList, disabled, tooltip, noCloseOnClick } = options ?? {};
+        classList ??= [];
+        disabled ??= false;
+        tooltip ??= "";
+        noCloseOnClick ??= false;
+
+        let button = this.appendChild(document.createElement("button"));
+        button.classList.add(...classList);
+        button.innerText = label;
+        button.disabled = disabled;
+        button.title = tooltip;
+
+        button.addEventListener("click", () => {
+            if (!noCloseOnClick) this.close();
+        });
+
+        return button;
+    }
+
+    addHtmlP(text, options) {
+        let { classList } = options ?? {};
+        classList ??= [];
+
+        let p = this.appendChild(document.createElement("p"));
+        p.innerHTML = text;
+        p.classList.add(...classList);
+        return p;
+    }
+
+    addSeparator() {
+        this.appendChild(document.createElement("hr"));
+    }
+}
+
+customElements.define("rkgk-context-menu", ContextMenu);
+
+export class ContextMenuSpace extends HTMLElement {
+    open(contextMenu) {
+        contextMenu.space = this;
+        this.appendChild(contextMenu);
+    }
+
+    close(contextMenu) {
+        this.removeChild(contextMenu);
+    }
+
+    openAtCursor(cursorEvent, contextMenu) {
+        this.open(contextMenu);
+
+        // NOTE: This assumes the context menu space is positioned at (0, 0) and spans the full page.
+
+        let areaWidth = this.clientWidth;
+        let areaHeight = this.clientHeight;
+        let menuWidth = contextMenu.clientWidth;
+        let menuHeight = contextMenu.clientHeight;
+
+        let x = cursorEvent.clientX;
+        let y = cursorEvent.clientY;
+
+        // If the menu would reach outside the screen bounds, snap it back in.
+        if (x + menuWidth > areaWidth) x -= menuWidth;
+        if (y + menuHeight > areaHeight) y -= menuHeight;
+
+        contextMenu.style.transform = `translate(${x}px, ${y}px)`;
+    }
+}
+
+customElements.define("rkgk-context-menu-space", ContextMenuSpace);
+
+export const globalContextMenuSpace = document.querySelector("rkgk-context-menu-space");
diff --git a/static/framework.js b/static/framework.js
index 13f3883..7754428 100644
--- a/static/framework.js
+++ b/static/framework.js
@@ -28,3 +28,43 @@ export function debounce(time, fn) {
         }
     };
 }
+
+export class SaveData {
+    constructor(prefix) {
+        this.prefix = `rkgk.${prefix}`;
+        this.elementId = "<global>";
+    }
+
+    #localStorageKey(key) {
+        return `${this.prefix}.${this.elementId}.${key}`;
+    }
+
+    attachToElement(element) {
+        this.elementId = element.dataset.storageId;
+    }
+
+    getRaw(key) {
+        return localStorage.getItem(this.#localStorageKey(key));
+    }
+
+    setRaw(key, value) {
+        localStorage.setItem(this.#localStorageKey(key), value);
+    }
+
+    get(key, defaultValue) {
+        let value = this.getRaw(key);
+        if (value == null) {
+            return defaultValue;
+        } else {
+            try {
+                return JSON.parse(value);
+            } catch (e) {
+                throw new Error(`${this.#localStorageKey(key)}`, { cause: e });
+            }
+        }
+    }
+
+    set(key, value) {
+        this.setRaw(key, JSON.stringify(value));
+    }
+}
diff --git a/static/index.css b/static/index.css
index 028f1fb..ebcb5c2 100644
--- a/static/index.css
+++ b/static/index.css
@@ -1,6 +1,12 @@
 /* index.css - styles for index.html and generally main parts of the app
    For shared styles (such as color definitions) check out base.css. */
 
+* {
+    /* On the main page, we don't really want to permit selecting things.
+       It comes off as janky-looking. */
+    user-select: none;
+}
+
 /* Main container layout */
 
 html {
@@ -90,9 +96,17 @@ main {
                 pointer-events: auto;
             }
 
+            & > .docked {
+                display: flex;
+                flex-direction: column;
+
+                & > * {
+                    pointer-events: auto;
+                }
+            }
+
             & > .docked > rkgk-brush-editor {
                 max-height: 100%;
-                pointer-events: auto;
             }
 
             & > .floating {
@@ -144,25 +158,47 @@ main {
 /* Resize handle */
 
 rkgk-resize-handle {
+    --width: 16px;
+    --line-width: 2px;
+
+    display: flex;
+    justify-content: center;
+    flex-shrink: 0;
+
+    &[data-direction="horizontal"] {
+        width: 100%;
+        height: var(--width);
+        flex-direction: column;
+
+        cursor: row-resize;
+
+        & > .visual {
+            width: 100%;
+            height: var(--line-width);
+        }
+    }
+
     &[data-direction="vertical"] {
-        display: block;
-        width: 16px;
+        width: var(--width);
         height: 100%;
+        flex-direction: row;
 
         cursor: col-resize;
 
         & > .visual {
-            width: 2px;
+            width: var(--line-width);
             height: 100%;
-            background-color: var(--color-brand-blue);
-            margin: 0 auto;
-            opacity: 0%;
         }
+    }
 
-        &:hover > .visual,
-        &.dragging > .visual {
-            opacity: 100%;
-        }
+    & > .visual {
+        background-color: var(--color-brand-blue);
+        opacity: 0%;
+    }
+
+    &:hover > .visual,
+    &.dragging > .visual {
+        opacity: 100%;
     }
 }
 
@@ -223,6 +259,81 @@ rkgk-reticle-cursor {
     }
 }
 
+/* Brush box */
+
+rkgk-brush-box.rkgk-panel {
+    --button-size: 56px;
+
+    height: var(--height);
+    padding: 12px;
+
+    & > .brushes {
+        display: grid;
+        grid-template-columns: repeat(
+            auto-fit,
+            minmax(var(--button-size), 1fr)
+        );
+
+        max-height: 100%;
+        overflow-x: hidden;
+        overflow-y: auto;
+
+        & > button {
+            padding: 0;
+            border: 1px solid transparent;
+            border-radius: 4px;
+            width: 100%;
+
+            display: flex;
+            flex-direction: column;
+            align-items: center;
+            justify-content: center;
+
+            overflow: hidden;
+            white-space: nowrap;
+
+            &.current {
+                border-color: var(--color-brand-blue);
+            }
+
+            & > rkgk-brush-preview {
+                width: var(--button-size);
+                aspect-ratio: 1 / 1;
+                background: none;
+            }
+
+            & > .label {
+                margin: 0;
+                font-size: 80%;
+            }
+
+            &.save-button {
+                display: none; /* visible when current brush is modified */
+
+                & > .icon {
+                    width: var(--button-size);
+                    height: var(--button-size);
+                }
+
+                & > .icon,
+                & > .label {
+                    opacity: 35%;
+                }
+            }
+        }
+    }
+
+    &.unsaved > .brushes {
+        & > .current > .label::after {
+            content: "*";
+        }
+
+        & > .save-button {
+            display: flex;
+        }
+    }
+}
+
 /* Code editor */
 
 rkgk-code-editor {
@@ -258,8 +369,6 @@ rkgk-code-editor {
     }
 
     & > .layer-gutter {
-        user-select: none;
-
         counter-reset: line;
 
         color: transparent;
@@ -318,10 +427,18 @@ rkgk-code-editor {
         resize: none;
         white-space: pre-wrap;
         border: none;
+        background: none;
 
         &:focus {
+            /* The outline is displayed on the parent element to also surround the gutter. */
             outline: none;
         }
+
+        &::selection {
+            /* The selection color has to be overridden for a good contrast ratio between text and
+               the selection. */
+            background-color: rgba(from var(--color-brand-blue) r g b / 0.3);
+        }
     }
 
     &:has(textarea:focus) {
@@ -341,6 +458,11 @@ rkgk-brush-editor.rkgk-panel {
 
     position: relative;
 
+    & > .name {
+        margin-bottom: 4px;
+        font-weight: bold;
+    }
+
     & > .text-area {
         display: block;
         width: 100%;
@@ -389,8 +511,12 @@ rkgk-brush-preview {
     border-radius: 4px;
 
     & > canvas {
+        display: block;
         border-radius: 4px;
 
+        max-width: 100%;
+        height: auto;
+
         /* The brush preview doesn't scale with DPI as easily as the canvas renderer does,
            so instead we pixelate it. */
         image-rendering: pixelated;
@@ -487,8 +613,6 @@ rkgk-zoom-indicator.rkgk-panel {
         line-height: 1;
         width: 6ch;
 
-        user-select: none;
-
         font-variant-numeric: tabular-nums;
         text-align: center;
     }
@@ -531,6 +655,51 @@ rkgk-connection-status {
     }
 }
 
+/* Context menu */
+
+rkgk-context-menu-space {
+    pointer-events: none;
+
+    & > rkgk-context-menu {
+        pointer-events: all;
+    }
+}
+
+rkgk-context-menu.rkgk-panel {
+    width: max-content;
+    display: flex;
+    flex-direction: column;
+
+    border-radius: 4px;
+    overflow: clip;
+
+    & > p {
+        margin: 0;
+        padding: 6px 12px;
+
+        &.small {
+            padding: 4px 12px;
+            font-size: 80%;
+            opacity: 75%;
+        }
+    }
+
+    & > button {
+        padding: 6px 12px;
+
+        border: none;
+        border-radius: 0;
+
+        text-align: left;
+    }
+
+    & > hr {
+        margin: 0;
+        width: 100%;
+        border-bottom: 1px solid var(--color-panel-border);
+    }
+}
+
 /* Menu bar */
 
 .menu-bar {
diff --git a/static/index.js b/static/index.js
index d287b0c..0045a00 100644
--- a/static/index.js
+++ b/static/index.js
@@ -16,6 +16,7 @@ const updateInterval = 1000 / 60;
 let main = document.querySelector("main");
 let canvasRenderer = main.querySelector("rkgk-canvas-renderer");
 let reticleRenderer = main.querySelector("rkgk-reticle-renderer");
+let brushBox = main.querySelector("rkgk-brush-box");
 let brushEditor = main.querySelector("rkgk-brush-editor");
 let brushPreview = main.querySelector("rkgk-brush-preview");
 let brushCostGauges = main.querySelector("rkgk-brush-cost-gauges");
@@ -134,6 +135,7 @@ function readUrl(urlString) {
     });
 
     let wall = new Wall(session.wallInfo);
+    brushBox.initialize(session.wallInfo.hakuLimits);
     canvasRenderer.initialize(wall);
 
     for (let onlineUser of session.wallInfo.online) {
@@ -290,6 +292,45 @@ function readUrl(urlString) {
         });
     });
 
+    // Brush box
+
+    function updateBrushBoxDirtyState() {
+        if (brushBox.currentPresetId == null) return;
+
+        let currentPreset = brushBox.findBrushPreset(brushBox.currentPresetId);
+        if (brushEditor.name != currentPreset.name || brushEditor.code != currentPreset.code) {
+            brushBox.markDirty();
+        } else {
+            brushBox.markClean();
+        }
+    }
+
+    updateBrushBoxDirtyState();
+    brushEditor.addEventListener(".nameChanged", updateBrushBoxDirtyState);
+    brushEditor.addEventListener(".codeChanged", updateBrushBoxDirtyState);
+
+    brushBox.addEventListener(".clickNew", () => {
+        let id = brushBox.saveUserPreset({ name: brushEditor.name, code: brushEditor.code });
+        brushBox.updateBrushes();
+        brushBox.renderBrushes();
+        brushBox.setCurrentBrush(id);
+        brushBox.markClean();
+    });
+
+    brushBox.addEventListener(".brushChange", (event) => {
+        let preset = event.preset;
+        brushEditor.setName(preset.name);
+        brushEditor.setCode(preset.code);
+        brushBox.setCurrentBrush(preset.id);
+        brushBox.markClean();
+    });
+
+    brushBox.addEventListener(".overwritePreset", (event) => {
+        let preset = event.preset;
+        preset.name = brushEditor.name;
+        preset.code = brushEditor.code;
+    });
+
     // Zoom indicator
 
     canvasRenderer.addEventListener(".viewportUpdate", () => {
diff --git a/static/random.js b/static/random.js
new file mode 100644
index 0000000..141d65b
--- /dev/null
+++ b/static/random.js
@@ -0,0 +1,9 @@
+const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_";
+
+export function randomId(length = 32) {
+    let r = "";
+    for (let i = 0; i < length; ++i) {
+        r += charset.charAt(Math.floor(Math.random() * charset.length));
+    }
+    return r;
+}
diff --git a/static/resize-handle.js b/static/resize-handle.js
index f8f8cac..b441be5 100644
--- a/static/resize-handle.js
+++ b/static/resize-handle.js
@@ -1,9 +1,7 @@
-import { listen } from "rkgk/framework.js";
+import { listen, SaveData } from "rkgk/framework.js";
 
 export class ResizeHandle extends HTMLElement {
-    constructor() {
-        super();
-    }
+    saveData = new SaveData("resizeHandle");
 
     connectedCallback() {
         this.direction = this.getAttribute("data-direction");
@@ -13,7 +11,13 @@ export class ResizeHandle extends HTMLElement {
         this.initSize = parseInt(this.getAttribute("data-init-size"));
         this.minSize = parseInt(this.getAttribute("data-min-size"));
 
-        this.#setSize(parseInt(localStorage.getItem(this.#localStorageKey)));
+        this.saveData.elementId = this.targetId;
+
+        // NOTE(localStorage): Migration from old local storage key.
+        let oldSizeKey = `rkgk.resizeHandle.size.${this.targetId}`;
+        this.#setSize(
+            this.saveData.get("size") ?? localStorage.getItem(oldSizeKey) ?? this.initSize,
+        );
         this.#saveSize();
         this.#updateTargetProperty();
 
@@ -21,6 +25,9 @@ export class ResizeHandle extends HTMLElement {
         this.visual.classList.add("visual");
 
         this.#draggingBehaviour();
+
+        // NOTE(localStorage): Migration from old local storage key.
+        localStorage.removeItem(oldSizeKey);
     }
 
     #setSize(newSize) {
@@ -30,12 +37,8 @@ export class ResizeHandle extends HTMLElement {
         this.size = Math.max(this.minSize, newSize);
     }
 
-    get #localStorageKey() {
-        return `rkgk.resizeHandle.size.${this.targetId}`;
-    }
-
     #saveSize() {
-        localStorage.setItem(this.#localStorageKey, this.size);
+        this.saveData.set("size", this.size);
     }
 
     #updateTargetProperty() {
@@ -53,9 +56,11 @@ export class ResizeHandle extends HTMLElement {
                 while (true) {
                     let event = await listen([window, "mousemove"], [window, "mouseup"]);
                     if (event.type == "mousemove") {
-                        if (this.direction == "vertical") {
-                            this.#setSize(startingSize + (mouseDown.clientX - event.clientX));
-                        }
+                        let delta =
+                            this.direction == "vertical"
+                                ? mouseDown.clientX - event.clientX
+                                : event.clientY - mouseDown.clientY;
+                        this.#setSize(startingSize + delta);
                         this.#updateTargetProperty();
                     } else if (event.type == "mouseup") {
                         this.classList.remove("dragging");
diff --git a/template/index.hbs.html b/template/index.hbs.html
index 3d455d8..fa55672 100644
--- a/template/index.hbs.html
+++ b/template/index.hbs.html
@@ -22,6 +22,7 @@
         <script type="module" async>
             import "rkgk/live-reload.js";
 
+            import "rkgk/brush-box.js";
             import "rkgk/brush-cost.js";
             import "rkgk/brush-editor.js";
             import "rkgk/brush-preview.js";
@@ -77,10 +78,21 @@
                         data-direction="vertical"
                         data-target="panels-overlay"
                         data-target-property="--right-width"
-                        data-init-size="512"
+                        data-init-size="528"
                         data-min-size="384"></rkgk-resize-handle>
                     <div class="docked">
-                        <rkgk-brush-editor></rkgk-brush-editor>
+                        <rkgk-brush-box
+                            id="brush-box"
+                            data-storage-id="brush-box"></rkgk-brush-box>
+                        <rkgk-resize-handle
+                            data-direction="horizontal"
+                            data-target="brush-box"
+                            data-target-property="--height"
+                            data-init-size="168"
+                            data-min-size="96"></rkgk-resize-handle>
+
+                        <rkgk-brush-editor
+                            data-storage-id="brush-editor"></rkgk-brush-editor>
                     </div>
                 </div>
             </div>
@@ -140,6 +152,8 @@
                 </dialog>
             </rkgk-connection-status>
 
+            <rkgk-context-menu-space class="fullscreen"></rkgk-context-menu-space>
+
             <div class="fullscreen" id="js-loading">
                 <rkgk-throbber class="loading"></rkgk-throbber>