As someone who used to work in production for a book publisher, I get ridiculously excited when I see books that have some unusual design or printing element. I was in Borders tonight and saw that the newly released mass-market edition of Wicked has bright, bright fluorescent green page edges (you totally can't tell from this image of the book cover, sadly). You know how really old books sometimes have gilt or red ink around the edges? Classy, right? Imagine it in green.
It's fantastic, because the book really pops out at you if you see a stack of them sitting on a table. So, snaps to HarperCollins. (Though I wonder how much it cost. Probably a pretty penny.) I almost bought a copy, even though I already have a trade paperback -- which I haven't even read yet. ;)
Oh but I did buy some books too (of course): The Runaway Bride by Julie Anne Long, Sexiest Man Alive by Diana Holquist, and Crazy in Love by Lani Diane Rich. Even though they have plain old paper -- no green ink anywhere. LOL. Proving that though I love pretty books, it's the words that really matter. :)