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.
Not sure what I think about using lighting in side the cabinets in the craft room. Maybe glass front cabinets on top of it? I tend to put small lamps into book shelves. So we are going to need outlets in the bookshelves. Any bookshelves in the house.
When I saw this, it made me think of a clubhouse style kids room. Could utilize a similar concept for a shared room for kids. Kids each have their own loft, then common space that functions as play room.