There are some variations to making these. You can use colored permanent markers (i.e. Sharpies) to color your stamped image. You can also use dye based ink pads to stamp your images, then bake the tiles in your oven to heat set the inks (350° for approximately 30-45 minutes). Another way to personalize the tiles is to add a photo to them. You will need to seal the photo with a sealant (such as Mod Podge). Keep in mind that the stronger the seal over the coaster, the less absorbent the tile will be. And finally, you can use larger tumbled tiles to make coordinating trivets or decorative plates.