If you've ever given a prepaid credit card gift card -- the cards with the Visa, MasterCard or American Express logo on them -- you might be surprised to know that more than $5 billion dollars on these cards never get used. If you have a stash of gift cards with a small balance on them -- even just a penny -- you can donate the leftover balance to help make the world a better place. Many nonprofits like the Salvation Army and the American Society for the Prevention of Cruelty to Animals have made it easy to give; just visit their websites and enter the details of the card and whatever balance you want to give is donated. Can you imagine if we all did this? Amazing things could happen.