The girls LOVE to play with shaving cream in the bathtub; I had to work up the courage to add in the food coloring to make paint like Having Fun at Home did. I don't know why I was so hesitant, As long as you clean immediately after it doesn't stain the tub. It does however stain children. Luckily the girls weren't too worried about the pink hands!
There is really no big secret here. Put shaving cream in a bowl and add the desired amount of food coloring. Mix and Paint!
Then they realized they could write in it!