I almost had to click the "report abuse" link on that image hosting website, that's a ghastly hamster zombie.
My quick costume idea is to go as a Viet Cong soldier. Unfortunately with the recent gun-related incident at UT involving an AK-47, I wouldn't be able to carry anything resembling an authentic assault rifle (the VC used AKs).
As per usual I'll be busy with school work, plus the trifling matter that I haven't been invited to any Halloween parties because I'm anti-social.