Cover Colors

I've spotted a trend in recent YA book covers: Purple and black.
I was going to make this a post on Beautiful Creatures and The Dark Diveine, but when I started looking, I found a LOT of other books with this color scheme.
Don't believe me?
















I'm not saying this is a bad thing, because I like them, for the most part. I assume Most of the publishing companies are trying to imitate the Twilight Saga covers, and that's why they're shying away from black and red. I've seen black/blue as well, not as much green. I haven't read most of these books, but a LOT of them are on my to-read list.