Beer Bottle Cap Crafts

Project / craft ideas for beer bottle caps?
My daughter has collected more than 6,000 bottle caps. Originally, the goal was to recycle. He said he could turn them into cash. Well, we never realized all the details and who are sitting here. Does anyone know of some cool crafts, cute or projects for the creation of such. And if anyone knows about recycling cash deal, please let me know. Thanks!
I can make lots of money and with this: Paste strong magnets on the back with high-strength glue to make big box office magnets. Drill a hole in the top, use a noose to tie leather cord on it, even the use of accounts, put hooks on the end and has a collar of the bottle cap. Sell to them as 3.50
Bottle Cap Craft DIY