I saw this on pinterest and had to try it with my kids. They loved it. I had some cheap shaving cream I had bought for the kids to play with. After putting shaving cream in each cup of a muffin tin pan, I added a few drops of food coloring and mixed it up.
At first ,the girls used the spoons I brought to mix it. Then they dug their hands into it and started painting the door, each other and their toys.