Here is a non-edible recipe (although it is not toxic) for play-dough/play-doh. It stays fresher much longer than the store-bought variety, not to mention the cost-effectiveness!!
1 cup flour
1/2 cup salt
2 teaspoons cream of tartar
1 cup water
1 tablespoon oil
food coloring, as desired
Combine flour, salt, and cream of tartar in skillet over medium heat.
Add water, oil, and food coloring, stirring until dough forms play-dough consistency.
Roll out on countertop and knead until cool.
Store in covered container.