If you have access to after effects, there is a plugin called 'Trapcode Particular'. Then there's a preset package you can get for free which gives you a choice of about 30 different sorts of fireworks.
You could then render out the firework explosions as a png sequence. They look about 90% real.
I only know this, because I created a 2 minute firework sequence that is projected on a wall for 'Legoland Discovery centre' in Manchester.
Or do what Photics says because they look alright and are built in game...
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Use particles that fly out from the center, then use gravity to make those particles fall downward.
I haven't tried it, but I suspect that's what created the fireworks in the video on the following web page...
http://gamesalad.com/products/creator
At the 1:16 mark there's fireworks.
You could then render out the firework explosions as a png sequence. They look about 90% real.
I only know this, because I created a 2 minute firework sequence that is projected on a wall for 'Legoland Discovery centre' in Manchester.
Or do what Photics says because they look alright and are built in game...
I'll be sure to look out for the fireworks when we take my nephew there in a couple of weeks!
I've seen a tutorial on how to create a sparkler in illustrator, but it was a static image. Sorry I can't be of more help...