Replace a closet door with a bookcase door. Awesome because then you have a secret room.
From Period Ideas
Elephant Buffet: How To Keep From Falling Down A Staircase~ Bookcase vs. Stair Rail
Office nook near kitchen/family room....I love the built in desk and seating area and shelves....cookbooks, laptop, bills, charging station and a place for mom to stay organized!
DIY Turn A Dull Wall Into An Impressive Floor-To-Ceiling Bookcase.
DIY: I want to learn to do simple DIY wood work like this, seriously!
Hollow Core Door Makeover
40 Recycled DIY Pallet Headboard Ideas | 99 Pallets
Hidden storage - need to maximize my space... or the kids can hide in there. LOL