We just went to a case lot sale at a local grocery store and after storing the cans we had some flat boxes that were just bigger then a regular piece of paper. What if we put a piece of paper in the box and then drop small dots of paint on the paper in various colors then add a few marbles and help them roll around to spread the paint around. This was a very fun art project. All the kids big and small were able to participate and have a great time with minimal mess!