Well, it's a recipe, only inedible.  Come to think of it, we all (myself included) have cooked something inedible from time to time.

Play Dough for Kids

1 1/2 cups corn starch
1/2 cup white flour
2 teaspoons cream of tartar
1 cup salt
2 cups water
1 Tablespoon vegetable oil

Mix all the dry ingredients together in a saucepan.  Add water and oil, mixing well.  Cook over medium heat, stirring constantly, until mixture gathers into a ball on the spoon, forming a dough. 

Dump the hot play dough out onto a large piece of wax paper.  When it's cool enough to handle, knead it like bread to form a pliable, clay-like mass.  Add food coloring if desired to make different colors.   

Store in a tightly covered container or ziplock bag.   Makes about 2 pounds of play dough. 

See Coffee Dough