Sadly, I won't be buying any earrings.. there doesn't seem to be an iconly recognizable symbol for the PC gamer in the same way that the controller is the "banner" of the console gamer. At least, not one that makes a good earring anyway.
Clay Super Nintendo from TheClayCollection - $23
CsCharms calls these "Retro Videogame Controller Earrings". I applaud their avoidance of copyright infringement. $14.95
Black 360 controllers from BouncyCreation - The bargain of the group at $9.
Ambergee80 are my favorite, because of the more subtle nature of the design. I actually think she could do a nice PC gamer version - maybe wasd keys in one-color stencil style? A gaming headset might work as well, or even a full keyboard if the detail can be done that small. $23