Well, it's tomorrow, but fireworks pictures can come out really well. The right settings depend on conditions and the effect you are going for. Fireworks will light up the environment, but it depends how big/bright the fireworks are and how close objects in the environment are. Short exposures will capture sharper fireworks, but will be dimmer. Long exposures will be very bright, but will reveal trails and whatnot. Medium shutter lengths will split the difference. Again, long, short, and medium are relative to conditions. Also note that fireworks have lots of bright points of light. If your sensor, lens, or filter(s) are prone to flare, chromatic aberration, and/or blooming, take steps to mitigate them. Don't just blindly take filters off of your cameras, though; if you're close to the fireworks, remnants can hit your lens; small chance, but worth considering at least briefly.
Sheep Rustlers in the sky! <S> Slapt | <S> FUI | Air Warrior II/III