Every once in a while when I'm rearranging the furniture in my living room, office, or garage, I reach for a sheet of graph paper. I draw the outline of the room, then make paper cutouts of each piece of furniture to scale, so that I can move them freely around the room until I find a layout I like.
Existing tools tend to either be more heavyweight, leaning toward CAD modeling, which can be distracting, or not full-featured enough. I'd like to hit the sweet spot in the middle, providing a quick and easy way to start sketching without feeling it feeling like a chore.