I figured out a way to make fireworks!!!!! It's actually very simple. All you have to do is get some useless dyes, gunpowder, paper, and a feather. First, combine a dye, gunpowder, and the feather to make the firework star. Then in a crafting bench, put a paper above gunpowder. Then put the firework star in with the paper and the gunpowder. At night, right click the ground and look up!