I've been pondering for a long time how to make tiles out of some of my mosaic images. I thought it would be both an interesting project and maybe, over time, a marketing idea. My original plan was to have the images printed onto glazed ceramic tile, but after scouring the Web, I realized that I would have to leave that to the professionals.
In the course of my search, however, I found a site called Above the Mark, which is a site that sells rubber stamp dies and other products, but also kindly offers complete instructions on how to transfer images onto tumbled marble tiles. It's time-consuming but fairly easy, using acrylic medium and laser copies. I've made several so far, and I love the antiqued look that results - as if the tiles had been dug up from an archeological site. I can enhance that effect by tinting the medium so the edges are a bit browner. I've stuck small felt circles on the back so they can be used as coasters (these are 4-inch square tiles). They make wonderful and personal gifts. I plan to experiment with larger tiles to offer as trivets. They can also be hung on the wall; one recipient of a Christmas-gift tile coaster is planning to do just that.