Now "Mesh Paint" allows you use painter material/texture (including volumetric materials) to define paint strength and color. This example demonstrates using smoke domain as painter....
Part Fourteen of a series on the complete creation of a character in Blender (Johnny Blender). This part works on the texturing process in Photoshop...
This is just a little fast demostration of how projection painting works, Blender 2.5 have support for pressure sensitive, the last builds have a button...