Firework creepers

Firework Creepers are rare variants of the creeper. They attack by launching their head towards you, after traveling 10 blocks, it explodes. it takes a few seconds for the head to regenerate. Firework Creepers are completely black except for their iconic creeper face, and firework explosion designs which cover their body. these features glow like spider and enderman eyes.

depending on where it spawns, the color of these features are different;

plains-lime green

mountains-light blue

nether (creative only)-red

etc.

if you kill a Firework Creeper, it drops gunpowder and (very rarely) blank fireworks