Love all of this ideas, but some of them I would be afraid to use, because it might damage the book (example the floating books). They all look beautiful and some are a great use for something you have no use anymore.
Fire place Bookshelf
(i would be afraid to use it for anything else than books. What if I spill something on them?)
Love how it use them to make it look good, change the whole aspect in the house
To be honest I have been thinking to do something like this in my house.
I don't know if this would be a good idea, but I love it