Fingerpainting is pretty much the simplest way to paint and personally I think it's the funnest way to paint too! You can actually conjure up some great paintings all from only using your fingers (and some paint)
In this video, a Brazilian street artist does a fantastic painting in 3 minutes using only his fingers !
[flash]http://www.youtube.com/v/QLZvDeC7-WM width=425 height=355[/flash]
If that hasn't gotten you riled up enough to start fingerpainting, here's a Chinese artist using black ink to imitate a requested picture extremely accurately in only a few minutes
[flash]http://www.youtube.com/v/P94SEqCa0WQ width=425 height=355[/flash]
So venture out to the streets and buy some oil paints, canvas', and a sturdy new set of fingers.