How a Pint-Size Entrepreneur Solved a Sticky Toy Dilemma When he was just 9 years old, Greyson Maclean discovered the key to his Lego frustrations on a pair of sunglasses.

Entrepreneur: Greyson MacLean, 13, creator of BrickStix, static-cling decals and stickers for embellishing plastic building blocks such as Lego and Mega Bloks.

"Aha" moment: MacLean, who has built with Lego since he could "put two bricks together," was frustrated with the stickers that came with the sets. If he pulled one off, gooey residue remained on the plastic; if he left it on, the brick was permanently labeled. "I wanted a way to customize my builds without ruining the bricks," says the Hartland, Wisc.-based entrepreneur.

In 2009, the then 9-year-old found the solution on a pair of sunglasses: a UV label that was stuck on the lens without adhesive. He tested it on his bricks, and the static-cling decal worked perfectly. He dubbed the discovery BrickStix. The company was founded in 2010; the cling decals debuted a year later at Toy Fair, the largest toy trade show in the Western Hemisphere.