A while ago I made a metal foil relief of my oc Leafhelm but had forgotten to take pictures and upload them.  
I embossed him into a piece of copper coated tin with the copper parts making up for his fur color. As for all the other parts I removed the copper coating with nail varnish remover and then repainted them; except for the helmet which I left unpainted. Remaining bits of copper give the helmet a rusty look which fits very well. Leafhelm dug up that helmet (too large to suggest that whoever made it had made it for a pony) when he got his cutie mark.