I recently entered a Challenge on Circle of Crafters to use a round tile with a square fold to make a card. I chose one of my own folds and followed the fold steps and made quite an interesting medallion. Because of the shape of the tile, the squash step shows white, but with the gradient tile it makes a pretty impact. Here is the card I made, and I'll share the Fold Sheet here.
You can find all of my teabag folds and tiles on my Photobucket Link.