This is a cool little trick that I often use when trying to create good clear poses. It's great help for creating things like character idle poses and to view the staging of a shot without the distraction of textures and model details.
If you’re using Maya with the default hot-keys then pressing “7” on the keyboard will display lighting in your scene. The trick is that if you don’t have any lights then you just get a solid black silhouette.
So incredibly simple but really useful!