MINNEAPOLIS -- High school proms are normally about tuxedoes, long gowns and high heels. But the footwear of choice for Minneapolis South High School students at this year's prom was Crocs, the brightly colored, plastic clog-like shoes that are anything but formal.

Cornelia Lutz and Lilly McLaughlin hatched the idea a few weeks ago of encouraging their fellow students to wear Crocs to their prom, which was held Saturday night.

The girls promoted the idea via a public Facebook page. It drew more scoffers than supporters.

But executives with Colorado-based Crocs Inc. spotted an article from the school newspaper on the debate. Soon 500 pairs of free Crocs were on their way to Minneapolis.

Students partied the night away in in red, yellow, blue, white and black Crocs.