A lot of people just scribble down a drawing on paper, and then use the "I Want To Take A Picture With My Camera" option. The floorplan is just a reference point, so you can makeup whatever floorplan makes sense for you. For example: https://lh4.ggpht.com/Y1z9Qt5EggwNdg0Caua9dJGWV8dZmnYhioten1...