I've seen variations on folded books or origami books and love the look of them. Anytime you can recycle books and enjoy them in new ways, I'm a fan! And as a librarian, I have access to books ready to be transformed before they hit the dumpster.
These are not particularly sophisticated, but they are simple and fun. These folds are super basic. I folded one page at a time rather than two's or three's. That gave them lots of fullness. I found out that you really need a book with a lot of pages or you won't achieve the full 180 degree shape. Use a bone folder for sharp creases and to save your fingertips (and avoid paper cuts).
When I was done with my folding, I sifted through my paper supply to find new endpapers to match my decor. I found these exquisite handmade waxed and printed papers in red, orange and mustard. I used a glue stick to add them to the inside covers, then filed the edges smooth.
I didn't find any information on mounting books, so I made up my own way. I cut a piece of black foam core slightly smaller than my open book size (trace around the book and cut with a craft knife).
Before you glue the book to the foam core, make a hanger. I punched holes side by side in the foam core with an awl. Then I wrapped some wire around through front and back a couple of times and twisted to close. That gave me wire hanger. I glued the books to the foam core with clear craft glue and then to make them even more secure, I punched an awl through the cover and the foam core under the pages where it couldn't be seen. I made two holes on the front cover and two on the back. I ran more wire around front and back to tie the book to the foam core.