The boys have been loving potato stamps.
I do the carving with a knife or any other sharp objects I can find.
Then the boys just dip and stamp away!
And this is what happens when you leave the room (NOTE: I would not recommend the leaving the room part). 2 boys mixing ALL the paint and one big bowl of gray. Oh well... at least they had fun! And with a little encouragement from me they cleaned it all up themselves.