Goop

This was a favorite of mine as a child, so I knew my children would love it. Just mix two parts cornstarch to one part water. This is how I did it: I put the cornstarch, water and a drop of food coloring (my kids LOVE colors!) into a ziploc bag, then I closed it tight and let my kids mush it all together. They had a lot of fun with that! When it was all mixed, I poured it onto paper plates so they could really get their hands into it. After awhile, they mixed their two colors together to make purple.