Backs on the Front Cover

At a local store recently I noticed something common among several of the books on a prominent book rack. Do you see it? What is the common thread?
The backs of women! 

I found this very interesting as I am working on the cover design for my first publication Seasons (coming out this fall). I personally love this trend. I'd rather be able to imagine the characters faces anyway. I love an obscure cover, don't you?

I do have a few pet peeves with covers though too. It bothers me when the cover shows a picture of the main character that is contrary to how they are described in the book. Or when they are just too busy, just trying too hard, ya know?

What are some of your favorite covers? What do you love or hate to see?