I would make the 'library' (our former office, but moved my desk into our bedroom) larger. I don't really need huge rooms anywhere else, I like cozy atmosphere. However we have 80 gajillion books. I have room for 1 tall bookcase and 1 small corner bookcase in the library. Then we have assorted other bookcases all over the house - living room, each kids bedroom, basement -- would be nice to have one larger room that has a really nice floor to ceiling, wall to wall bookcase where all the books in the whole house would fit. That would free up space in the other rooms too.