Sulfur Lava in Chaos Cubed

Sulphur Lava is a rare and unique form of real Lava that is blue in colour.

I believe the new Sulfur cave biome is the perfect opportunity to introduce it, replacing any natural lava formation in the biome with Sulfur Lava. 
It can functionally differ from normal lava by giving players/mobs nausea on top of the burning effects. And used in a cobblestone generator will instead create cobbled sulfur blocks.