I think the first US one sheet is my favourite of the posters (Natalie in the black swan make up), it's very striking. The one above with the black feathers is nice too, but was it actually ever printed?
The art deco styles posters are interesting, but I don't really feel they fit the tone of the film that well. But I like them because they're nicely designed and something a bit different.
Loved the film, I thought it was absolutely fantastic.