Salt water aquariums full of beautiful tropical fish and reef creatures creatively installed. (I'm actually fairly fond of northern fish, but the fish can easily be changed, it's the tank that's hard to get.) I want one
I love things that hide things. I especially want that bathtub and the vent/safe. The TV hiding all the other electronics is a great idea, but I'd imagine there'd have to be some kind of sensor in order to work the other stuff.