We love playing with goop! It is a crazy consistency which seems to change from liquid to solid and back again as you play with it. It's hard to explain. You're just going to have to try it for yourself to see what I mean! It is one part water one part cornstarch (add more or less depending on the consistency you want) plus food coloring to make it pretty. On this day we used four different colors for extra fun!
We love messes! The bigger the mess the more fun we have. There's no such thing as "too messy" at our house!
Idea from: http://www.playcreateexplore.org/2010/11/fun-with-goop.html