I prefer to create my avatars purely from mathematical patterns, but for you I would recommend one of two styles:
A) a character from a book/game/movie/whatever that you like.
B) an artistic image/drawing/picture, or just something you like looking at.
EDIT: Actually, I just remember an old photo I took that would work well as an avatar for you, because it's of a Rose. Let me dig it up real fast.
EDIT: Well, no luck finding it. Whatever, think about my other suggestions, or go with something else that you like.