We tried making and using chalk painting today. It gets two thumbs up from all of us. We mixed one cup corn starch and one cup water then added food coloring. Couldn't be easier.
First Claire and I painted while Bea was at school. I have trouble engaging her in things sometimes - she just isn't interested in concentrating and doing something like this for as long as her sister would be. So we painted for a little while and then we did more painting when Bea got home.