Mushroom caves in the Caves and Cliffs update

I like the mushroom biome, but I think it needs something more. What if in the upcoming Caves and Cliffs update, there was some kind of mushroom cave? It could have blocks from the big mushroom trees used in the floor and walls. There would be all sorts of mushrooms growing too. You might also be able to put a big mushroom tree if the cave is big enough, similar to the trees you sometimes see growing in caves and ravines.