Sublimated Nike Elite Socks
Cam'ron broke the Interwebs when a photo of these Nike Elite socks with an image of him in his famous pink chinchilla outfit was released. That led to massive lineups at RIF Los Angeles, where said socks were being sold. So, in short: Thank Killa Cam for partly starting this trend.
Since the pink Cam socks, there have been a few others released, including ones with the Dipset eagle, Larry Bird, and even Trinidad James. Now, guys everywhere are trying to step up their sock game.