In the past for Halloween, I’ve often dressed up as internet memes (Rick Astley, anyone?) or topical things from the news (like Matt/Mitt Romney). This year I was running dry on ideas until a few days before Halloween. Then I started to think about famous artwork–more on that in a future Halloween post.
One idea that I prototyped was Rene Magritte’s Son of Man painting. It’s easy, fast, and cheap:

All it takes is a novelty bowler (~$8) and a plastic apple (~$1.50, although you might have to buy a pack of six). Assuming you already have a suit and can borrow a red tie, you’re good to go for only $15 or so.
This year I got into Halloween, so I may post a few more Halloween ideas that I played with in the coming days.