I don't know if someone has already posted this.. But in the men's section of the shaving products is the Colgate brand shaving foam stuff.. Really cheap.. usually on the bottom shelf..
I've done this once with my daughter, but instead we used cool whip and she was finger painting with it... It was great.. She was 1 1/2 and I have some great photos of it.. Still have the pictures she painted even though the colors faded a bit... we did that in 2002
Yea, I used the cheap colegate brand of shaving cream for a different project. I'm thinking of using the same brand for this project so that way I'm not spending way too much on the first try.