You'll need dark colored ceramic tiles (available at Home Depot type stores), glass etching cream (available at Michael's type stores), appropriate stencils, cork sheeting, strong bonding glue, scissors, and a plastic spreader (not metal or glass) for the cream (I used a plastic, disposable knife).
First, lay out your stencil on the tile before peeling the backing off, to get an idea of placement. You don't want to be lifting and replacing it, getting fingerprints all over the adhesive, weakening the seal, etc. Once you like how it'll look, peel the back, stick it on in the appropriate location, and press. You'll want to do an extra rub down around the edges where we'll be placing the cream. It's very easy for it to seep under the edge and ruin the look of the image.