You can use left over ceramic tiles for coasters, They can be painted then sealed or you can mod podge a picture or pretty napkin on the top followed by a couple of coats of waterproof mod podge. Wishing you the best.
I have used left over floor tiles for the top of an end table or plant stand. You can also break up tiles and use as mosaic or a mosaic embedded in a stepping stone. Check out this creative idea:
https://www.hometalk.com/546226/this-is-another-section-of-a-mosaic-floor-i-created. Just a few ideas for you.
20 ideas: https://hative.com/creative-ideas-for-reusing-leftover-ceramic-tiles/
Hi, I made backyard tic tack toe boards using leftover tiles https://www.homeroad.net/2018/07/summer-diy-tic-tac-toe-game.html