I was Monica Lewinski a few years ago and it turned out to be a GREAt costume
Another great one I saw, and this might be fishing back a ways, is to be Mary, from Theres Something About Mary, you know the hair gel scene LOL
One idea I have for this year is to be something tacky, I haven't had a "fun" costume in a while, one of my friends suggested a she devil, he seems to think it fits my personality. A few of the girls at the house have also suggested an angel.
Have fun with whatever you decide to dress up as