Start with collecting odds and ends - lace, buttons, springs, watches, gears, keys, washers, anything you can find that intrigues you.
My old keys were rusty so I used a product called Ospho which oxidizes rust and puts a protective coat on them so they no longer rust. It turned the keys black.
I let them dry overnight.
Then the fun begins. To attach pieces I used E6000 glue, as well as wire.
This is a spring that was a perfect backdrop for attaching a couple of cool buttons. Here are a few of my results:
Then I tried my hand at placing pieces more broadly, to make more chunky statement necklaces:
Enjoy! Let me know if you tried to make some too!