When we were kids, we made homemade Gak. It was so much fun, and for some reason the recipe has been burned onto my brain. It's so simple and so amazing at the same time. To make your own, mix 2 cups of water and about a tablespoon of Borax in a bowl. In a separate bowl, mix 1/4 c. Elmer's Glue and 1/4 C. water. (or use the 1 to 1 ratio) Add a few drops of food coloring if desired. Slowly pour the glue mixture into the Borax water and watch a rubbery cloud form. Pull it out of the water and knead a little bit. Voila! Instant fun.