Use a penny to trace around to make small circles for crafts (applique, scrapbooking.)
Stuff pennies into your change jar and cash in every so often (my last cash out netted me $260, and the teller who took the coins told me his uncle bought a Corvette with saved-up change!)
Use a penny to scratch off lottery tickets (okay, maybe not on
this forum.)
Use pennies to make sculpture:
penny towers