Karen, the people over at Garden Junk would use them for making a bowling ball. You might ask over there, they would have LOTS of ideas.

You could mosaic a flower pot or table top, I bet it would be really pretty black and white. Picture frames, too.

A mosaic checkerboard on wood. Wish I had them.

This was one of first projects. I used the leftover tile from the shower stall we had put in. It is done over an old terracotta pot. Use tile adhesive to apply to pot. I kept the plain one but the others had the word herb or had small flower tiles (from an old saucer).Grout and voila! I made five last year for presents.
Ann

Sorry pic disappeared

You don't have to stick with the black and white. I painted tiles with oven bake "glass paints". You can stencil designs onto them... or do as I did and paint them to look like Victorian China... then break the pieces and use them for mosaics. I covered a pitcher with them and you'd never know it wasn't made with broken China pieces.