Mypaint has now been added to FL:2-devel.
from their website
MyPaint is a fast and easy painting application. It lets you focus on the art instead of the program.
It comes with a large brush collection including charcoal and ink to emulate natural painting. Other features are:
- support for pressure sensitive graphic tablets
- unlimited canvas (you never have to resize)
- no layers (work in progress)
- using pygtk with C extensions
If you want to look deeper, MyPaint is built around a highly configurable brush engine. This allows you to experiment with your own brushes and with not-quite-natural painting.