Since I work a lot with recycled glass, I decided to see what was possible with some surplus 4 inch glass tiles left over from a back splash remodeling project. This type of tile has a special coating on the back to aid in adhesion to thinset and prevent the thinset from showing through. So essentially I am burning off this coating and just slightly etching the glass. Black enamel covers the white coating to give it a B&W photo look. As always, the quality of the photo dictates the end result. Tiles make for an interesting medium for displaying photos.