Halloween Costume Ideas

So for school I'm either going to be a rubics cube or a Christmas present.

But I need a "for fun" costume. So far the options are:

1. A St. Patty's Day fan (someone who is too drunk to realize it's Halloween)
2. Caesar salad--Lara's suggestion--a toga and lettuce/bread belt
3. Miss America (done before...)

Anybody have an idea for me?