edible finger paint - it worked well (used gel food coloring and fage greek yogurt). 21 month old didn't quite get the concept of finger painting and wanted to eat it instead :) Wait so youre telling me. you can eat paint now?
Fill spray bottles with food coloring water to paint on snow. I have also seen pictures of kids with jars of colored water and paintbrushes. I remember trying this as a kid. It was so fun! If Texas ever gets snow