Paint that grows. Mix 1 cup flour, 3 tsp baking powder, 1 tsp salt, and enough water to make consistency of pancake batter. Divide into 4 parts and put in snack size Ziploc baggies along with food coloring. Squish it around to mix up the colors. Rubber band like icing bag and snip tiny hole. Squeeze to paint and then pop paper in microwave for 30-45 seconds and watch the paint puff up and grow.
Sharpies and Rubbing Alcohol. Cooler than tie dye