You buy wadded-up paper now!

http://www.origamiboulder.com/

From the FAQ:

Quick! Somebody buy one!

Generation Y’s Pet Rock?

Chicken make terrible house pet.

Some fads are misunderstood. A woman I know went out to buy a Pet Cock. She came back with a small brass valve.

I’d like to say that the idea was presented by Matt Groening’s comic strip Life In Hell in the Eighties.