Splatterboard
Splatterboard is a drawing program along the lines of the original Kid Pix. It is under development, but currently provides:
- ~13 brushes
- ~5 kinds of paint fills
- Stamps, mostly from PDClipArt.org
- Multiple levels of undo
- A handful of primitives
- Various other tools
Download for OS X (It runs on Linux and Windows, but I only update the OS X package.)