When I saw that this month's theme was "Darkness," I immediately thought of light painting. However, it took me half a month to upload my first entry.
Light painting is done in (almost) complete darkness. When we attempted it, we were even instructed to wear black clothes. a person moves a light source and another (or others, in our case) captures the motion of the light source in bulb mode (shutter is open as long as the button is pressed).
I showed another shot from this light painting session in a previous post, My 2nd Light Painting Shot.