I made a couple of Iron Golems (or whatever other metallic construct) from a cheap Heroclix miniature:
I had just bought a bunch of metallic paints and I wanted to try them out, so I painted them with various shades of silver and bronze.
I then applied Nuln Oil on it, which is the secret weapon to have metal look good. I also tried some Nihilakh Oxide on it, but it was my first try using it and I'm not sure it worked really well.
What I learned is:
Overall, I'm satisfied with the result; I think they look great, they were cheap to do, and I learned about my paints.