Start saving your dryer lint for this. Make Lint Dough that they can sculpt into blocks, animals or anything else their heart contents. Canaan squashes his to make a "ball" and throws it at Cosmo...chasing him all over the house. Poor Cosmo!
Lint doughCombine 3 cups dryer lint (pulled apart), 2 cups water, 1 cup flour and 1/2 t vege oil in a pot. Stir continuously over low heat until mixture is smooth and binds together. Pour onto wax paper to cool.
Recipe & photo from http://www.realsimple.com/home-organizing/new-uses-for-old-things/new-uses-kids-old-things-00000000019019/page9.html