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Have you wished you had invested money early in a blockbuster invention? Learn the stories behind some (seemingly) ridiculous ideas that have made inventors and investors very wealthy, and find out what you, as a potential investor, should look for and consider before putting up capital for a potential funding opportunity.

The Koosh Ball

You've may have never heard of Scott Stillinger but somewhere in your home or office you probably have one of his inventions – the Koosh ball, which made millions of dollars. Stillinger came up with the idea for the Koosh ball when he tied rubber bands together to create a smaller, easier-to-catch ball for his young children in 1987. He founded OddzOn Products Inc. to distribute the small, simple toy, and within just 12 months it was flying off of store shelves as that year's hottest Christmas gift.

The company expanded, and in 1994 Stillinger sold OddzOn to toy manufacturer Russ Berrie and Company Inc., which in turn was bought by toy behemoth Hasbro in 1997 for more $100 million . And it all happened a mere 10 years after the first ball was created. (For more on mergers and acquisitions, read our tutorial: Mergers and Acquisitions.)

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Santa Mail

Every year, millions of children around the globe pen letters to Santa and hope for a response. Byron Reese realized the potential in this market. In 2002, he launched "Santa Mail," a service that allows kids to send letters to the North Pole. Parents enclose a small fee of just $9.95, and little Johnny or Jane receives a personalized letter back from the "big man" himself. By 2009, Santa Mail had responded to nearly 300,000 children. At close to $10 a letter, well, you can do the math - needless to say, it was a little idea that has earned Reese a big return. (Get some tips on how to come up with your own winning business idea . See 10 Breakout Ideas For Small Businesses .)

Lucky Break Wishbones

Are you still a little bitter that, at last year's Thanksgiving dinner, you lost out to your cousin Ned in the annual fight over the lone turkey wishbone? Well, thanks to Ken Ahroni, those days are long over. In 1999, he had something of an epiphany at his family's Thanksgiving dinner table: a family with multiple people would like multiple wishbones. He shuttered his previous consulting business and launched Lucky Break Wishbone Corp. in 2004, in order to sell his one-of-a-kind breakable plastic wishbones. Within two years, the company was generating nearly $1 million in sales through distributors in more than 40 states nationwide.

Antenna Balls

You've seen them; maybe you even sport one on your car. Those ubiquitous, yellow smiley-faced balls perched atop antennas in parking lots nationwide have made Jason Wall a very wealthy man. Inspired in 1997 by a commercial for the fast food chain Jack in the Box, Wall created some antenna ball designs and began selling them locally through auto stores in California in 1998. Within a year, he had earned more than $1.15 million in sales and quickly won major accounts to sell his product through national chains, including Wal-Mart (NYSE: WMT ).In 2009, the multimillionaire is president and CEO of In-Concept Inc.

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