Here we have a very practical "business card" for Sk8 School in Vancouver, though I hope they don't have to use it too often!
Sk8 School's Band-Aid Business Cards
Similar Designs:
Eduard Cehovin's Rubber Band Business Card
L2D's Folding Business Card
Analisa Vargiu's Medical Business Card
The Howler Magazine's Colorful Business Cards
Thought and Theory's Advertising Business Card
BC Adventure's Edible Business Cards
Happy 4th of July!
Ideas for Creating Great Business Card Designs
Genix Design's Holographic Business Card