One of my favorite things to do with Penny lately is paint with watercolors. The only rules I give her are:
(1) No black.
(2) Rinse your brush between colors.
(3) Look for a white spot to lay down a new color.
And then I let her go to town. When she's done I take a 5 x 7 mat (using it as a viewfinder) and move it around the painting till I find a nice composition, mark it, cut it out, and voila! A fine abstract piece, courtesy of a 2 year old. We've been giving them out as birthday cards.