This is also not an ATC, but pretty neat anyway:
Of course, this was the swap, so every day was something different. Some days I decorated the page entirely, other days I just wrote my one sentence and moved one
The best part, which I'm kicking myself for not taking pictures of, was how I actually bound the book together. Each two or three pages were sewn together in little booklets, and then the booklets were attached to a spine, by wrapping thread around them. Then the spine alone was glued into the cover. Next time I'll take more pictures!