Screaming Pixels permitting of course!
I love fireworks!! Have a combination of Alchemy, Fuel making and smelting plus ability to grind up crystals or coloured gems - add a few fireflies and perhaps a bit of helium and you get the Glitchian ability to make and launch fireworks!
This could give favour points to your fav giant and improve the mood of anyone on the street you launch on.
Plain crystal could make a "Stoot Sparkler" - +5 mood for you, + 2 for everyone else on street
Amber could make a "Pleasing Peony Shell" + 7 mood for you, + 4 for everyone else
Sapphire could make a "Showy Saturn Sunburst" + 9 mood for you, +6 everyone else
Ruby could make a "Modest Maroon Mine" + 11 mood for you, +8 everyone else
Moonstone could make a "Luminous Looper Rocket" + 13 mood for you, +10 for everyone else
Diamon could make a "Whalloping Willow-Wizzer Whistler" +20 mood for you, +15 everyone else
Favour points could be say 20% higher than the normal donation depending on the Giant you choose when launched. Oh, and I expect that you would need a "Permit for pryo-combustible ballistics" from the Bureau.
I've named the fireworks after real types of firework but kept in the spirit of the gem that made them.
Teams of Glitchians could team up to do displays thus mutlipling the benefits.
Theres also a part of me that thinks the fireworks should be more audio then visual - which might resolve any graphic problems (forgive me i am not a huge technical expert!) - also, any group displays would be more like a concert than a display.
Launched for discussion! xx