I updated the Coloring Book gallery on my site today. It's got about twice as many images in it now. They're all print sized PNGs of my line art, and there's about a year's worth of them. They're Creative Commons licensed, though SoAP, VTSFFC, Technicon, and Rising Star all have my exclusive permission to use these for group/convention advertising. Otherwise, they are not to be used for commercial purposes.

http://www.rainbowsaber.com/gallery/colorbook