These are some samples of fireworks shot on July 3, 2011 at Grand Geneva and July 4, 2011 at the Fontana Public beach.  I used a tripod, ISO 50, Sutter Bulb, Aperture f11-f13 and a towel to add multiple exposures in the same frame.  Edited in Photoshop CS5.

Here are some more samples from the day: Grand Geneva Fireworks, Fontana Fireworks Display