There doesn't necessarily have to be rust any old patina will do.
The blues and greens of copper exposed to salt water and acid rain, time darkened silver and rich gleaming brass are all beautiful in my eyes.
Coins found in the street are treasure. It's even better when they have been run over a few times. Unidentified bits of hardware from a friends junk drawer are fascinating. Pieces of brass hardware from the salvage yard force me to bring them home.
This trash fuels my imagination.
Shown a little love from steel wool, the Dremel or a polishing cloth their surfaces become amazing. The process of combining them with other objects to create wearable art provides me with many hours of work that both intrigues and fascinates.
I decree that my theme song shall be Oscar the Grouch's:
I love trash
Anything dirty or dingy or dusty
Anything ragged or rotten or rusty
Yes I love trash.
P.S. I'm not so sure about the rotten bits!