These coasters were done at a Stampin' Up Retreat that I went to last Winter. These are easy and simple to do but you have to be sure to do them correctly. The coaster part is a ceramic tile like they would put on your back splash in your kitchen, the rough stone looking ones. You can get these at any home supply store like Home Depot or Lowes.
Large Stamp, the simpler the easier
Stampin Up Staz On Ink Pad or similar permanent ink
Clear Embossing powder
Embossing gun or heat source
Spray on shellac or sealer
4 Felt circles per tile to put on the underside
#1-Clean off tiles with damp rag so they are not dusty
#2-Take Stamp and ink the stamp well with Staz On Ink, make sure it is completely covered
#3-Stamp on the tile, be very still because you do not want to smudge the design. If it is an intricate design, be extra careful and press firmly so the ink is transferred to the tile.
#4 Immediately after stamping the design pour embossing powder over the design on the tile and shake so it covers the entire design, discard the extra in a container and reuse, then immediately clean off the stamp...remember the ink is permanent so you don't want to ruin your stamps!
It is very important that you do this right away after you stamp because the ink dries quickly, so you really must act fast.
#5 With an embossing gun or other heat source, heat the embossing powder until it crystallizes and forms a protective coating.
#6 Allow to dry for 12-24 hours
#7 Spray sealant or coating on the tile so that it is protected
#8 Let sealant dry
#9 Place adhesive felt circle pads on the corners of the underside of the tile