A less-mess approach to painting with children: Sidewalk Paint.
Kids are messy when they paint but paintings is such a great creative outlet. Here is the solution:
1/4 cup water
1/4 cup cornstarch
A few drops of food coloring
Mix different colors in the cups of a muffin tin, supply brushes and a bucket of 'eraser' water, and slather on the sunscreen! Your kids will have fun and your house will stay clean, especially if you hose them off before they come in, or have them run through the sprinklers!