Metamorph League is themed GREEN and Black. Dangerous stuff like Volatiles should be colored Green!

Lightning Mirages and normal Volatile balls are already bright blue and orange so the visuals match their danger, the exploding volatile shit from Metamorph bosses should also be a bright color

Metamorph volatiles are literally the one place in the game where it would be acceptable to make them Neon Green. Hell, make the bosses themselves have a green tint