I've been working on some kind of effect system for Mesh Paint. Hardest part of it is to make it work along all those UV-islands mesh very likely has. Some simple effects are partly ready but they currently only work on planar mesh, so still about 3/4 of work to do.
Here are previews of two basic effects. First, spreading / expanding paint:
And dripping paint (Ya, I know it could look better. I'm working on it.):
And special thanks to everyone who donated to support my development! :)