There's Even Money In Eye Black...

EyeBlack.com, which markets stick-on, logo-displaying eyeblack that athletes use to protect themselves against sun glare, "will sell a couple million pairs to a variety of customers this year," according to CNBC's Darren Rovell.

EyeBlack.com President & CEO Peter Beveridge said the company sells the product to "teams, players [and] fans, because the fans like to wear what the players wear, and then it's a great sponsorship or gameday giveaway product."

Rovell said the company's "biggest orders" have come from "corporate America," including HBO, which recently used EyeBlack in marketing materials "to promote its NFL reality show, 'Hard Knocks.'"

The NFL and the NCAA currently don't allow players to advertise on EyeBlack.

But if there are dollar signs involved, it could be a marketing opportunity down the road.