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.
Retractable bed in the tiny home of Vincent Kartheiser (from Mad Men). I'm kinda geekin' out on this bed.and the fact that Vincent Kartheiser lives in a tiny house! - I love the retractable bed!, could you have under-bed storage?