They manage to get something resembling snow into balls, don't they? So... why not fireworks? It's a difficult technology, though.
Apophysis 2.06 and Corel Photo Paint for signature. This is my entry in *Apophysis
' Weekly Theme Challenge #C6H2(NO2)3CH3: Kaboom! Let's get wild and festive, fireworks fractals! [link]
(careful... broken css here).