If you're looking for some interesting bookshelf designs, I've been scouring the Internet for ideas. I think sometimes lovers of books are as much in love with bookshelves as they are with books. Here are a few websites with some intriguing photos you may enjoy.
From Rank Nepal:
A couple built along stairways, which seem useful, and a couple that are simply design intensive that look fun but seem less than useful.
From Bookshelves on Pinterest:
Some gorgeous shelves full of books plus some very artistic shelves full of design that happen to be perfect for shelving books.
From Bored Panda:
Lots of very creative solutions that are both pleasing to the eye and easy to use, and some accommodate the reader.
From Life Hack:
These are all design-intensive, less about utility and more about looks.
From Corner Bookshelves on Pinterest:
A lot of these are kind of cozy corners for reading.
And there are lots more if you just search "Bookshelves" on Google Images.