Trying to pick out a Halloween costume to make or buy, whatever is cheaper.. it needs to be nerdy/epic/silly. Ideally something that would work as a pair with Christophe for when he's out here for Halloween :) Ideas, anyone?

EDIT: The ideas you guys came up with on Facebook are amazing. So far, the winner is an Elmo-themed version of this:
http://www.motifake.com/sesame-street-slayer-cosplay-demotivational-posters-101124.html
Keep the suggestions coming!