Here’s a cover trope I’ve seen a couple of times: the face in the city.
The Beautiful Between by Alyssa B. Sheinmel, published May 2010. It’s pretty distinctive a cover: gray with the face of a girl hovering over the New York City skyline.
And a bit of a twist on it is this one:
Other Words for Love by Lorraine Zago Rosenthal to be published by Delacorte in January 2011: This time, we have a close up of a girl’s lips (see this post) over the New York City skyline.
It’s an interesting style, I think. They’re distinct enough that there won’t be any cover confusion here, but they are composed of the same elements.
I know there are additional ones, so if you know of any, share them.