make bird feeders/houses/birdbaths for your garden
smash them and mosaic a table or wooden birdhouse or the inside of a birdbath, make a house number mosaic, mosaic the front of your front steps
Freecycle. Or Goodwill
You can use some to make a garden birdfeeder or waterbowl. Just glue them in a stack, let dry, then fill with either seed or water for your backyard birds to enjoy.
donate to a thrift store.
Make pretty pin cushions. The holidays are not that far away. Here are more ideas than you will be able to handle!! https://www.google.com/search?q=tea+cup+pin+c...
Glue the cup and saucer together with a good glue. Stuff the cup full of batting, very firmly!!!Take a circle of pretty cloth, and gather it into the top of the cup, Hot glue the fabric in place, and Viola!!! a neat pincushion!!!!
OR.. glue them together in a stack, and place in your garden as a watering place for the birdies..
Make some DIY suet and mix in some bird seed, fruit, etc. Fill the cup 3/4 of the way, sticking a stick in it once it starts to harden. When set, hang the cup from a hook (it will be tilted). My niece posted this on Facebook; she may have seen it on Pinterest. It was so cute, and a great food source for birds in the winter. It would probably melt in the summer.
how about using them as containers for home made candles and giving as gifts?