I've been really into fall florals this year. It's a little darker and more unexpected than the traditional 'April showers bring May flowers' kind of floral. I also like the fall palette background colors behind brighter blooms; makes for a nice, almost oxymoron mix. And you can't really beat the beauty of nature, even in all its simplicity.
(photos collected from urbanoutfitters, galmeetsglam, flickr, xovain, wonderlandpdx, thisisglamorous, anthropologie, and natalie-dressed)