Corruption - Polluted Reefs. This biome is themed to the ocean, and having ocean themed enemies. Was created to fit to Count Eelron.
Crimson - Twisted Truffles. This biome is themed to mushrooms, and colored to Shrimpy Truffle. Was created to fit to Trufflemeister.
Hallow - A honey/bee themed biome, that should fit to empress of light''s queen bee version.
I thinking we don't need hell replacement, because roots of yggdrasil can go to the depths of world.
I think that would be funny, but what if swap corruption with crimson?