Here's the left arm cuff for a Red Sonja costume I'm currently working on (scale mail bikini I made also posted).
The design for her adornments changes by artists and time so I've been drawing from several different artworks and picking and choosing things I like and making it my own a bit. I decided to go with some "emeralds" and the design part was some wedding sticker things I found. They were silver and I painted them gold. I thought they might make nice armor adornment.
The material is a metallic poster board type paper I find in scrapbooking sections of craft stores, backed with Foamies for sturdiness. I think that's about it.
I'm very excited about finishing Red Sonja and debuting her! Slated for Dragon*con 2011.