Here's a great idea if you have an office that also doubles as an occasional guest room: Use an integrated Murphy bed to camouflage the bed part.
When tucked away, it looks like a workspace with a matching storage cabinet. When needed, it looks like this:
In addition to office guest rooms, this could help those of us with small living spaces. I couldn't find the source for this unit in particular, but there are DIY versions you can make.