One thing that really appeals to me is having different variants for mobs that spawn in a certain biome. Perfect examples are the husk (zombie) and stray (skeleton) in cold and warm biomes, and the snow fox in cold biomes.
As the mountains biome is getting an update, I think it'd be nice to add the chinook salmon to the list. They look a bit different than the normal salmon, but are known to be a delicious treat for bears.
I made a texture (courtesy of my resource pack) that I'd happily share if needed:
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