Chalk in My Pocket: Batik on Paper + Salt Watercolor Experimentation
For the Munchkins: Hot glue rubbing plates. Make your design with hot glue on a square piece of cardboard, let dry and then hand it over to the kids with some sheets of paper and crayons to rub over.
10 Minute Homemade Finger Paint - kids love this stuff and it's so easy to make! From Over The Big Moon!