Why can't I customize the creation of my iPhoto books anymore?

I am trying to create an iPhoto hard cover book. Maybe I'm doing something wrong, but I can't find a way to lay out my own photos, as I've always done in the past - once I have selected the photos for the book, the only option I can find is to buy the book with the layout of Apple's choosing, which isn't at all the way I want it. Is it no longer possible to make a book the way I want to?