Movie theater in the attic.
Hidden doors -- This company makes cabinets, bookshelves and anything you can think of that fits your existing doorjambs thus hiding the door (and also making use of the space).
Sink for mudroom
Bookshelf Closet Door = More Storage
basement idea: Hidden Under Stair Storage
use plate hangers to display photo albums
A simple magazine rack.
making things easier in the kitchen: menu board
make life easier kitchen idea