3CH is a fun software to bring new ideas for speed painting. I programed it last year with the participation of the Ubisoft Crazy Concept Artist Team (Vyle, Sparth, Barontieri Viag and M@ for the Darwin theme).

More information here (English) or in French here. Enjoy !

3CH (if it doesn't work, just intall .Net Framework 1.1 here)
Web version (less customizable than the Software version)