It would be awesome if you could design your own dream house and share it.
This could be done with a simple 3D editor where you can pick a 'background' and place your walls and rooms where you like. The app could even be in VR.
That way you can create an office with an awesome view for productivity, have a neat bunker for your media stuff and a gym for your VR activity apps/games!
Or what about your own VR maze?