This activity is a BIG hit with Ruby. Just a drop or two of food coloring in a cheap can of foam shaving cream. Then a few paintbrushes and a paint tray borrowed from our art supplies. She actually likes this a lot even when I just spray out the shaving cream and leave it white, so that's what I usually do. We practice letters and numbers and she loves drawing clouds.
Tip: check first to see if the food coloring stains your walls. It left some of my grout a little bit tinted.
