Well we had a sci fi party a few weeks backs and I was almost going as a Dalek with the same budget the Dr Who lot had...Basically a cardboard box on my head with the word 'Dalek' written on it...then I found a cheap pirate costume and said I was a Space Pirate.
Or with whole box thing, go as Solid Snake. The halloween party we had the other day, a few people went as Tetris, just cardboard boxes fitted together and strapped to the person and the box were painted in a colour.
Or scruff up some old clothes, dirty them up and go as a homeless guy. With that, get some newspaper and wrap it around a glass bottle.
Or...as you live in Norway, borrow one of Grandma's weapons and have some crazy eyes and then you can go as him.
I love Nancy DrewG, but not insert brain here