Don’t forget the movies for inspiration. The Social Network is a huge hit right now — consider going as the FB founder (a nerd with a billion dollars in his pocket!) or else movie stars (Lindsay Lohan with a big old SCRAM bracelet) or rock stars (Lady Gaga in any of her famous get ups!) or even Donald Trump (with an exaggerated comb over).
People in the news who aren’t famous make interesting inspiration — be an elated Chilean miner for Halloween or else do something abstract, like someone who’s gone “green” (environmental) who is actually painted green and has recyclable bags and car keys to a hybrid in tow.
Does that help!?