This is one of my more expensive projects so far because the tiles were $12.99 a bag and I used 2 bags. However, I was able to use some old chipboard/pressboard from an old cheapy bookcase (you know the flimsy backing stuff?) and cut it into squares for the base of these adorable mosaic tile coasters.
They are simple to make; I used 1/2 inch tiles, some tacky glue and my pressboard for backing. Arrange and then glue to your hearts content!