Particular has a fireworks preset. It looks pretty good, a little cheesey, needs some tweaking, but if you buy it you can use it on EVERYTHING afterwards
Or just go out and buy your own fireworks and a case of beer and film them on a camera turned 90 degrees sideways so you get more pixels.
Make sure you do it on a black background or at night and use UNMULT or screen blend. I guess that depends on where you live though.
detonation films has a library of examples of that (www.detonationfilms.com)