I have a project that I'm brainstorming that would really benefit from a firework effect. I would be using this where the midi notes start at the piano and then go up. The vision I have in my mind is the midi notes shooting upward fast, trailing some sparks, and then bursting into a random firework effect at a random distance above the keyboard.
I realize that is probably a lot of coding for an effect that won't get used that often, but in my mind it looks really, really cool. :)