Books, books and more books! I've always wanted to have a high-ceilinged room with books from floor to ceiling. so high in fact, that you need one of those slidey-ladders to reach the uppermost shelves.
Love the idea of a hallway library - in a small house you need all the space you can get, and it is not always feasible to dedicate an entire room to books. Also, with the entire wall lined with built-in bookcases it makes hidden doors more hidden.
Real Page-Turners: Our Favorite Bookshelf Organizing Ideas