I don't know which came first, the Livestrong rubber wrist band or Eduard Cehovin's but it seems that there's already a trend for these kinds of business cards.
Eduard Cehovin's Rubber Band Business Card
Similar Designs:
Eduard Cehovin's Clothespin Business Card
Sassen Design's Cool Rubber Stamped Business Card
Sk8 School's Band-Aid Business Cards
Behind Every Great Business Card Is a Great Designer
Reparto Creativo's High Quality Business Card
Dr. Harnal Kirpov's Beauty Business Card
Analisa Vargiu's Medical Business Card
Stitched Unique Business Card by Alex Kransky
The Howler Magazine's Colorful Business Cards