Cosplay ideas for a teenage girl?

I need an idea for a costume for Comic Con. I'd like it to be something that not a lot of other people will go as (like... like Ramona Flowers last year). I'm a (really) pale, five-foot-seven, seventeen-year-old girl with dark hair and hazel eyes who is not opposed to wearing wigs (actually, I love wigs). I'm not into anime. I love period costumes. last year I went as Coraline (got mistaken for Ramona Flowers). I adore make-up and overly girly costumes. I'd prefer to not wear something totally shapeless... a dress or something fitted would be nice. I love comic books, musicals and disney movies. costumes I've considered: Princess Yue (Last Airbender), Misty (Pokemon... I know it's anime), Astrid Hofferson (How To Train Your Dragon), Marie Antoinette, Hello Kitty, Lottie (The Princess and the Frog), Silk Spectre I (Watchmen), The Corpse Bride, Briar Rose (Sleeping Beauty), Wonder Boy (The Venture Brothers), Lady Au Pair (The Venture Brothers), Baby Doll (Sucker Punch), Ariel (Little Mermaid), Columbia (Rocky Horror), Roxy Richter (Scott Pilgrim). any ideas or opinions?