I need a Halloween costume, stat!

[twesterm]

So I'm going to a party tomorrow and I need a fun Halloween costume.  I don't want something incredibly lame like an army guy or a ghost, I want something cool but I also need something that I could easily build in a few hours.

Any ideas?

I wanted to be a Monarch henchman but I don't think I would be able to get all the pieces to make it good.