Underbed Play Table with Drawers - The table will fit under most beds and rolls out easily. The storage drawer is on castors so your kids can just wheel it out for easy access. Features: reversible top with blackboard on one side and white on the other, and jute rope handle.
Fold down space saving wall bed. Why sleep on an uncomfortable sofa-bed just because you have space for a normal bed? This stow away bed was designed and built by Carpentry.London, it features a full size king size mattress and is made for everyday use. When folded up it takes minimal floor space and looks very discrete. It can be folded down in less then a minute and folded back up just as quick.
Bemz slipcover for turning bed into daybed - good idea for dual-use guestroom - is the site that sells this, but I couldn't get a photo to attach. Tons of colors and several sizes to choose from - going to make a couch from twin beds.