10 Cave Update Ideas that should be in Minecraft

Minecraft caves are boring, but what about sandstone caves? Or ice caves? Or a cave troll boss? This Cave Update ideas will be added to the game, if Mojang decided to add these ideas in Minecraft.
==10. Sandstone Cave==
Sandstone Caves are made out of sandstone and sand. Stone blocks in this cave will be replaced with sandstone. New ores can be found in the cave, these ores called "Desert Glass" and "Peridot" will be found in the Snadstone Cave. 4 new mobs such as "Sandy Skeletons", "Cave Scorpions", "Desert Cave Zombies", and "Sandstone Vipers"