Here's an applique idea:
https://shop.ajpadilla.com/index.php...product_id=391
If you Google "cocktail coloring pages" you may find some simple ideas that could be turned into applique.
Also, if you Google "cocktail fabric" some great-looking fabric comes up that could be used in simple coasters.
It's a great idea. Good luck. Of course we want to see what you come up with!