A growing trend in China is key rings made of plastic bags filled with colored, oxygenated water and a small fish, turtle, or other amphibian swimming inside.

They sell for around $1.50 each and come with a warning that the animals should be freed soon after purchasing since they will eventually suffocate.

http://edition.cnn.com/2011/WORLD/asiapcf/04/14/china.animal.keyring/index.html?iref=obinsite