These are some results I got by using my Metal_Bade_ generator.
You can purchase this generator on Gumroad: https://gumroad.com/l/Rezkb or: https://www.artstation.com/marketplace/p/yYll/metal-badge-generator
From 1 or 2 simple grayscale input, I can achieve many different variations pretty quickly.
Generator features
Intro and quick tutorial video