Directions for coasters made from ceramic tiles are all over the internet. Michelle and I made these using 4 inch tiles from Menards, (11 cents each), a jar of Mod-Podge and a few sheets of scrapbook paper. The backs of the tiles are rough so we glued on some squares of vinyl to finish them off. Cork or felt would be a good way to finish the backs as well. I sprayed the finished product with clear acrylic finish, but I don't know if it was necessary.