I'm looking for a halloween costume to wear for school?

I'm 11 years old and I need a costume to wear to school and for the dance. I've been a hippe twice, a cat twice, a fairy, and piglet but that one was when i was really little! i don't want to come out like any of the other girls, and i know an older girl that is going as facebook, with a white t-shirt, blue jeans, and writing book across her face. so um yeah, no fairies, animals, nothing childish. something original would be great! so, if you could please answer! i have no idea what i should be! well, i have one idea: a 80's girl? tell me if that's good, OR give me something else! i'm dying for an answer if you can't tell already. thank you SOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO… much!!!!!