I recently did a night time workshop.
This was by the side of a lake, off camera flash to models left and right. I had someone flick up the scarf as i was about to take the photo, not sure if it works as it almost looks like i've superimposed it.
Lightning and mist were added in and thankyou @tracywilliams for pointing me in the right direction for these.
brushes from http://www.obsidiandawn.com/