Yesterday was HOT and in the 90's in humid Ohio. My son and I decided to make sidewalk chalk paint and have a little fun. It's easy and cheap. Mix equal amounts of water and corn starch. Add food coloring. Fun, fun, fun! He was bummed when he spilled it. But that's when I showed him that it's okay and he walked in it and made footprints. Then I taught him how to splatter paint. He loves art so much. He also loved his green/blue feet and hands (and hair). It washes easily too.