Often I would edit bitmaps in programs like MS Paint and then import them back into my notebook. To save time I developed a tool to edit the pixels of an image within a notebook: Wolfram Paint.

Features include:

• Three tools: pen (single pixel change), bucket (change all identical pixel groups), and eye drop (get pixel color)
• Mouse down uses primary color, Control + mouse uses secondary color
• Editable "favorite" colors panel
• DominantColors automatically loaded as "favorites"
• Uses RGBA color space
• Resizable image, inset, and zoom
• "Undo" to a state that you first manually bookmark
• click-and-drag moves the zoomed region (left panel) or edits pixels (right panel)

I'm sure I could mimic other tools like drawing lines, circles, or other primitives, but as a proof-of-concept I'm pleased that it was only 300 lines of code.

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