I've seen variations of tile coasters all over the internet so I decided to give them a try.   First I tried vinyl but couldn't seem to find anything that I could use to coat it with that wouldn't make the vinyl peel up.  I saw some that had been etched with etching cream and thought that was a great idea.  Only problem is I only had white tiles.  So I thought I maybe I could color the etching cream with alcohol inks and it would then stain the tile while it etched.  Well this does not work.  It etched the tile but since its white on white you could not see it unless you tilted it sideways and looked for it.  So I had to figure a way to color the etched portion of the tile but not the rest of the tile.  Well as you can see its not perfect but I wasn't really going for perfect, I was going for the process that would work.  I figured it out and now I can work on perfect.  I did put one coat of all purpose enamel on to make sure the color can't be washed off.