Make 1 kind of play dough, and another day try the other recipe.
Divide into teams. Each team makes 1 kind of play dough and then gives half their
dough to the other team. Decide which recipe makes the best play dough.
Make a batch of play dough to give to someone special, with a card.
Double the recipe.
Make both kinds, and then survey people to ask them which kind they like better. Keep track of what they say, and graph the results.