I found this easy but very cool project on a wonderful blog called "TeachKidsArt". It was a very do-able project for my participants and they loved the 3-D results. A different spin on a Valentine's Day art project.
Summer Activity. 1/4" Mt Dew in bottle, add tiny bit of baking soda and 3 capfuls of hydrogen peroxide. Shake and it glows. Pour on sidewalk to "paint"...Who knew!? (The kids will have a blast!!)" doing this this summer