Coins in a jar
My husband and I empty all of our change into a jar at the end of each day (or you can do each week). When the jar is full, I head down to Commerce's Penny Arcade and cash it all in. You would be surprised how much in change you can save up in a short amount of time. Sometimes we put it in a savings account, or I have used the money to pay my cell phone bill. Hey, every little bit helps!