Hey I'm 14, but I have a few ideas that are not too mainstream. (: I hope these help!
The Sun Drop girl- If you know who she is. If not, Sun Drop is a soda, and in their commercial there is a girl who always dances with a can of it in her hands, she wears a read band around her head, a shirt that says Sun Drop (they sell one like it at Walmart)and she wears jean shorts with leggings under them, you can easily just google "Sun Drop girl"' and she should pop up. (:
- Last year I was Flo, the Progressive girl, she just simply wears an apron saying Progressive on it, and she wears her hair in a bump-it style. (: Once again, its super easy to find on google if you still don't know who that is. (:
- Cher Lloyd- super simple if you know who she is, she has many different outfits and hairstyles that it should be easy to match her. (:
- I know there are a lot of people who would not call themselves "Directioners" and if you don't you can just skip to #5, but my four friends and I are dressing up as "Girl Direction", in other Words, we are dressing up in their casual outfits. I am going to be Louis (I love Louis <3) and so I am wearing red skinny jeans, a striped shirt, a beanie, and my TOMS. (:
- GO AS A HIPSTER ahaha jk, don't, hipsters scare me... well, unless your a hipster... then no offense... (;
So I hope that helped... and if not... then maybe just sit in a bush on Halloween and throw Skittles at people screaming "do you taste the rainbow now?" (: