I saw a reference to Rendera in the Portable Freeware archive. Rendera is a free graphics program suitable for artistic painting, photo-retouching, colorizing, and seamless tile design. It emulates common art tools and features an easy-to-learn, albeit ugly, interface. What I like more about this utility:
- Very small program file
- No installation needed
- Very responsive
- Awesome watercolor-like tool that mimics paint spread very well.