Some of those designs are very clever. I like the whimsy of the books hanging from the ceiling. The digitally fabricated, wavy wood shelves are lovely and remind me of Gaudi. But all the oddly shaped and curvy designs make me dizzy -- seriously. The one closest to my personal aesthetic is the slightly gothic-looking nook with the black shelves and red chair. Most of the nooks wouldn't work for me because I don't like small spaces, like under a stairway.
I definitely enjoy having ""a deeply comforting amount of books that we will never be able to read in its entirety in our lifetimes" -- which is why I have bookcases in every room and piles of books on every surface in my house. I'd love to have a large, elegant, traditional sort of library space for them all. (You know -- with Persian rugs and paintings and chaises longues.) There are many pictures of such spaces in At Home With Books by Caroline Seebohm.
I don't really approve of organizing books by the color of their spines.
Heh! Actually, aesthetics does affect how I arrange my books. I spend a lot of time arranging a bookcase that will be visible according to book size and color, and whether a book is hardcover or paperback. Books I don't like to look at go on shelves in a closet. Once I get a bookcase arranged, it usually stays much the same for years. So when I get new books, they pile up until I have the space to make a new shelf for them. Sometimes I like to prop a book with a beautiful cover up against the rest of the books on a shelf -- just like in a bookstore. I lerrrrrrve my books.
Remember when the only books I would have visible on my bookcases had black covers? :-)