Books with unusual formats

I'm a sucker for books with unusual formats. It's one thing to come across a great story, but it's way more awesome to find one that's told in a unique style rather than the normal prose format. Here are five books with unusual formats that I recommend, in order of how much I enjoyed them:

1. Illuminae by Amie Kaufman and Jay Kristoff - This was my favorite read last year. Even if there was nothing special about the book's formatting, I would've loved it. The fact that it's told through messag...