Cat Box's unique business card is the only one I've seen around with a tail.
Cat-box.net's Folding Business Card
Similar Designs:
Lucky Cat's Cute Business Card
Machine Box Recordings Letterpress Business Card
Fuel Haus' Unique Business Card 
Box 5 Graphix' Graphic Designer Business Card
Richard Ritornell's Unique Musical Business Card
We Are Designers Creative Business Card
Rítmia Music Therapy's Colorful Business Card & Identity
Wedgienet.net's Funny Business Card
Velvet Ant.net's Cool Business Card