As an entrepreneur, you've probably had that moment when you recognized a need for a product that hadn't been created yet. Jonathan Hall and his wife, Kate, had that moment a few years ago when they noticed something missing from the iPod's accessory aisle. They saw a plethora of fancy skins and cases, but nobody had bothered to tackle the simple, plain white earbuds so prominently displayed in music lovers' ears. So the Halls introduced flexible rubber charms called Emotibuds to the market, which retail for $12 for a set of three pairs. The rubber charms clip onto earbuds and feature a variety of faces incorporating an emoticon in a cartoon style. Check out this article in The New York Times to find out how the Halls transformed their vision into an actual product. Like most entrepreneurs, they faced challenges throughout the process.