The perfect gift for book lovers would be gifting them book-themed accessories rather than some book which they already have. Some very creative ideas are given here like chairs made with bookcases and are also a place for creating library, candles which have the essence and aroma of old books, lamps which are made in shapes of books etc. Some very innovative ones are also here like bookmarks with fingers pointed to the lines where we have stopped reading, pillows which comes in shapes of books. There are many other gifts too. In this link you will find many such innovative things which one can unhesitatingly gift to book lovers.
#1 Pointing Finger Bookmark Showing Exactly Where You Finished Reading
Image credit: amazon.com #2 Pillows Shaped Like Books
Image credit: amazon.com #3 Leather Book Cover Phone Case