Without fingernails, humans would have to smash open soda cans on rocks and chew on pillows during scary episodes of House. Reward multipurpose digits with today's Groupon: for $15, you get $30 worth of designer nail polish from Lex Cosmetics. Shipping and handling, which starts at $5, is not included with today's deal.

Lex Cosmetics helps dress fingers in an ever-changing array of vibrant, cruelty-free nail polish. The online retailer's rainbow of shades spans from purples to reds with colors and titles such as Seattle Sunshine, Sassy Pants, and Toast ($10 each). Each shade in the lively lineup was submitted by a customer, voted on by brand devotees and imbued with a biographic color story that explains its inspiration. The long-lasting nail polishes eschew formaldehyde, DBP, and toluene, and forgo animal testing in favor of simply asking rabbits whether or not they'd wear each color to prom. Additionally, Lex Cosmetics donates a percentage of their profits to organizations and non-profits suggested by shoppers.