Ingredients? Need some sparkly in there, maybe some beryl to give them some color. Barnacle powder for sure, that stuff burns good. Various molecules. maybe even some crushed gems.
+1 to crushed gems - right now they have no real use other than currant/donation value. (or decoration I suppose)
Perhaps: fireworks could be crafted at any time, but they can only be set off on holidays. (there really aren't many things to make glitch-calendar holidays special right now, except for zilloween) Setting off fireworks on any other day could require a special permit from the bureaucrocs. (so it's more likely to be done only on special occasions, because it requires some paperwork & effort)
Also: how about "quoin fireworks"? Not just a visual display, but actual quoins appear in the vicinity, that everyone can then run around and collect... more interactive! Or "item fireworks" which scatter a variety of random party items across the location. "Hi fireworks" too!