Tea bag folding is a sort of origami which uses small squares of paper with the same pattern, folded in the same way and then arranged so as to form a symmetrical rosette or medallion which is then used as an embellishment specially on greeting cards.

This paper craft was created in Holland by Tiny van der Plaas. Apparently she needed to make a card for a friend and absently began folding tea bag envelopes thus creating a unique embellishment.

Nowadays, you can find plenty of tea bag tiles on the Internet for free download.

I must admit this is not my favourite technique simply because I cannot get neat folds as you can see from some previous attempts of mine when I first began making cards:
Tea bag foldingTea bag foldingTea bag folding

For really gorgeous cards made using tea bag folding you should visit KoolCrafts' Flickr page. Her folding is so neat and her cards beautiful as well as all her other origami projects. If you want to try or further develop this technique and need inspiration this is the place to go.

Here are a few links you may find useful:

Free tea bag tiles

http://www.teabagfolding.circleofcrafters.com/freeprintabletiles.html

http://madeinniagarafallsca.com/

Tea bag folding projects

http://madeinniagarafallsca.com/

http://www.dotcomwomen.com/crafts/teabag-folding-butterfly.shtml

http://www.cardinspirations.co.uk/demo/demo16.htm