Of course with safety in mind, lighting up some steel wool that has been packed into a whisk, and spinning it around during a 30 second exposure, gives you a spectacular image like this one, which I took alongside the Scripps Pier in San Diego, CA this past Saturday night.

30 second exposure
f/6.3
ISO 200
Manual focus and exposure
Canon 40D
Canon 10-22 mm lens at 17mm