A few weeks ago I was painting some canvases to go in Talmage's room. Normally I wait until nap time to work on messy projects like that, but Talmage was having an unhappy morning and I realized we could just paint together to keep him entertained. So I covered him in a garbage bag, and let him have at it on a piece of cardboard. I was a little apprehensive letting him use acrylic craft paints, but he did great and we have no stains left from the adventure.
He was very careful to paint the edges of his cardboard, just like I was painting the edges of the canvases.
He had such a great time! I think we'll need to get some washable paints in the not-too-distant future so he can paint more often.