I did something similar last year but had the kids paint on the tiles and then made it into a table...super cute. I looked and looked and couldn't find anything like you're describing. I have a friend who is an artist, who suggested using glass paints, which I did, and they worked great. There are a few steps you need to follow, and if I remember correctly, the instructions were on the container for the glass paint. You need to prep the tile with a solution, which needs time to dry. (but you need to paint within 24 hours of applying or it needs to be redone) When the paint dried I then sprayed it with a finishing spray - you can buy matte or glossy - I chose glossy. Then let dry. This method worked well for me. The table turned out super cute. Let me know if you have more questions - I can go back and look at the exact names of things I used if you are interested in using this method!