Paint in a Bag

Found this idea on Pinterest also.  Instead of a messy painting experience, you put two or three colors of paint in a zip lock bag, then tape it onto white paper.  The idea is that the child(ten) will mix the paint in the bag with their fingers and hands.
Sam was having none of it.  He kept trying to rip the tape of the bag and open the bag.  We ended up with the messy painting experience after all, which led to a bath.