I Need Costume Ideas For Spirit Week at School and Halloween!!!?

I'm a senior, too. i suggest Gumbi the cartoon but that might be hard to find. Last year i was a boy scout and im a girl maybe you can be a girl scout but that costume is hard to find too... this one guy was a transformer, one time guys at my school dressed up as tetris pieces (just a box with lines and color) and walked around together. i suggest powerpuff girls or three guys dressed up as jonas brothers and walked around with a guitar hero guitars and a stereo with their songs just some ideas :) Good luck