Two things for me, really...
Circuitry is big on me... No, really... It's on me. There's just something about them. [http://thumbs.dreamstime.com/thumblarge_359/123324236759I62l.jpg] I plan on getting more. [https://dl.dropbox.com/u/65110350/facebook_1347999285.jpg]
Another thing is Welding masks. Not really a symbol, but if you play a lot of FPS's, it makes sense to wear one. You have no peripheral vision, Gas-masks are out of the picture, and you'll probably want something protecting your Face. I shoveled money out for a cosmetic item in a game for the first time to unlock Foundry Worker Aldridge. [http://www.gamestar.hu/apix_collect/0907/killing-floor-outbreak/killing-floor-outbreak_screenshot_20090727192001_normal.jpg]