Start by cutting the paper towels in half to make little square canvases.
Paint the outline of snowflakes, stars, christmas trees, etc. onto the paper towel with the white paint. Let completely dry.
In a muffin tin, add water to each cup. Drop in food coloring and stir.
Put the paper towels on a cookie sheet and have the kids use the dropper to drop color onto the paper towel. The white outline remain and it looks awesome!