I've seen the MLP Customs around for a long time and I finally took a stab at it myself. Firefly themed, wearing an Independent Soldier uniform similar to what we see Zoe wearing in the first few minutes of the pilot episode. I need to tidy up her mane a bit and a few more tiny details, but otherwise she's done.
Not that anybody knows us, but it's a uniform done to the regs for a Browncoat costuming fan group I'm part of. If you've been to Dragon*Con at any time since 2007 and seen the parade, you've seen us. The Battalion mascot happens to be a Nightmare, so I had a built-in excuse to do a pony-Browncoat. The rest of the Battalion loved it!