Turn a bookshelf on it's side and add an upholstered foam top to make a cute storage bench
Simple & Cheap DIY Floating Shelves! FREE plans and tutorial at Shanty-2-Chic.com
Helping Kids Grow Up: How To Turn A Bookshelf Into A Storage Bench
DIY Entryway Bench - Storage Bench
corner base cabinet shelves
Make a pocket door like this and put photographs over glass panes for now when it's a bedroom then remove later.
DIY Lazy Susan Pantry