this is a quick and fun project for you and your kids. Please mind that I haven't bought a paper towel for years now but I borrowed it from a friend and that will work too.
what you need:
cup with water
and non-toxic water color paint for kids
I put different paint colors into the egg carton holders and have Tristan paint on the paper towel. The more water he uses the better the paint mixes - but careful, you can tear it easily. Then just let dry. It is also a great tool to teach how colors mix together. Happy mixing!!!