Hanging Mushroom caves

so in this biome there would be giant mushrooms hanging down from the ceiling and small ones on the floor i think the mushrooms would be a special color for this biome such as blue, purple, green, etc. in this biome there would be a special mob it would be a spider with the caves mushrooms covering it  kinda like a mooshroom spider there would be small and medium bodies of water in this biome and (could maybe be found with on the surface by seeing the mushrooms stem sticking out on the surface) the stem of the hanging mushrooms would be craftable into a type of brick and maybe a type of tile