Well, it's a recipe, only inedible. Come to think of it, we all (myself included) have cooked something inedible from time to time.
1 1/2 cups corn starch
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