Komandor's slated sliding closet doors are the perfect solution for converting "dead" space into usable storage space with minimal cost. Add some shelves and organizers and you'll have a fully functional closet.
Attic Bedroom Closet Design, Pictures, Remodel, Decor and Ideas - page 9 - sublime-decor. I have the perfect wall (with attic behind it) to do this. I've often thought of making an easily accessible closet there.