This collection of images were captured during a couple of night time excursions by members of my ND400 Long Exposure group on Facebook. The patterns are created by igniting steel wool packed inside a metal kitchen whisk and then swinging the whisk in various ways to create the desired effects.
I recommend that if your interested in giving this a try you should wear protective clothing to prevent igniting your hair or clothes. Also stay away from areas of dry grass or bushes. A beach is a good place for trying this kind of photography. Have fun!!