NFL's Ricky Jean-Francois: Tricks Out $6,000 Nikes ... With Marty McFly

Great Scott!!!!

It ain't too common to see someone pimp out a pair of rare $6,000 Nike Air Mags -- but Washington Redskins defensive end Ricky Jean-Francois did just that ... and TMZ Sports has the pic.

The kicks -- more commonly known as the "Back to the Future" shoes -- are hot commodities in the sneakerhead community ... but Ricky wanted to do something special with his pair.

So, he brought 'em to Dez Customz and Kreative Customs -- who spent 50 hours lacing up the sneaks with some custom Marty McFly inspired art ... complete with Doc and the legendary DeLorean.

The artists had plenty of space to work -- considering Ricky rocks a size 15 shoe!!

Fun Fact -- British rapper Tinie Tempah once paid $37,000 for a pair of Air Mags!