Ice Peaks!

In an update, penguins could be added with colony behavior during new snowstorms. They would boost the boat’s speed depending on how many penguins swim together, and the boost would last for 5 minutes after they fall behind, in their Frozen Peaks biome.

In the same biome, Ice Palaces/Temples could generate, inhabited by the Ice Illager (also previously suggested in the Mob Vote). Besides making ice fall onto players, it could drop a special item such as a Magic Ice Block.

Inside the palace, some corridors could contain items frozen inside special ice blocks. These would need to be melted with torches or campfires to release the items; breaking the ice would destroy them. Frozen chests could contain new loot, including Magic Ice Blocks and a new Raid Potion that only works in snowy-biome villages, where Ice Illagers would appear during raids.

The Magic Ice Block could slowly freeze nearby water. It could also be combined with items in a crafting table to create frozen decorative versions, or combined with a normal Raid Potion to create the new one.

Illager outposts could also have biome-specific details, while Iron Golems could have different vines depending on the biome, such as dry vines in deserts or orange vines in savannas.

New blocks of ice bricks could be added on the palaces