Haven't tried this yet myslef...but looks like a good idea... Cheap and Easy Stamped Coasters made from affordable Bathroom Tiles. This blog shows step-by-step how to make these. Great gift to give for house warming, bridal/wedding, Christmas, etc. So cute and useful!
No Bake Porcelain...Easy DIY -
DIY lace pottery.....this may be what everyone is getting this year for Christmas!
Stamped Tile Coasters Tutorial.
Turn Tiles into Coasters by Stamping them with Paint!
Give Old Maps New Life as Tile Coasters -- everytime you travel somewhere new, pickup a map, and make a coaster when you get home.