A gallon of gas? It won't get you too far. A gallon of milk? If you have a big family, it can be gone in a day. But a gallon of paint? It can go a long way, meaning leftover paint is a common occurrence. If you share our quest to make everything old new again, consider using the leftover paint to renew or revamp your home. Here are 19 cool projects you can do with 128 ounces or less.