His Dark Materials trilogy by Philip Pullman. Fantasy. Okay - so no surprises here! But these books are just fabulous - definitely challenging for a struggling reader and at the upper end of the 7-13 age group - I would say a confident reader aged from 10 to 100!
The rich colour scheme of this library was determined by a Mannerist painting by the sixteenth century artist Francesco Morandini. http://www.houseandgarden.co.uk/interiors/bookshelf-ideas-living-room-study-design/traditional-black-and-red-floor-to-ceiling-bookshelves?next#ViewImage