Had a twin bed similar to this once, with built in storage at the head - even a "secret" compartment under the bookshelf. Awesome Storage Ideas For Small Bedrooms : Space Saving Storage Ideas for Small Bedrooms – Better Home and Garden It looks so cosy
Lofted beds with walk-in closet underneath. Good when you're short on bedrooms for all of the kids. Loft beds and instead of a closet underneath, it could be the kids "rooms" for private and quiet time.