Jill over at The Activity Mom recently posted some fun bathtub ideas for little ones. We've already made shaving cream paint many times but I hadn't thought of glow sticks.
The coloring is weird because of our red heat light. Monkey absolutely LOVED the glow sticks. I grabbed a package that was all yellow without realizing so we'll be doing this again with multi colored sticks but it was still tons of fun.
I particularly liked them with bubbles in the tub. The glow sticks stay just under the water and light up the bubbles from underneath.