Frozen Caves

I think Caves in snowy biomes have frost stone instead of Normal Stone with Icicles in the ceiling. Icicles drop on nearby entites and damage them. Cave Paintings are present in Ice caves and shows Cavemen Villagers hunting Mammoths. Also If the player uses brushes they can dig out a mammoth skull. Maybe Players can find Frozen Mammoths and can unfreeze them using flint and steel (This is definitely a idea for another update). All skeletons are replaced by strays.