Cliff under a Tree (CliffTree) - Datapack
A vanilla-styled worldgen overhaul, with new biomes and touches to existing ones
Ice and snow fills the caverns under snowy landscapes. Image brightened for clarity.
Between the jungles the rivers got improved featuring mud and beautiful sand, tropical fish reside in these rivers
Savanna Plateaus got a big improvement, featuring terracotta stripes as well as greener pastures
Deep underground, a cave filled with magma, lava and basalt, as well as higher concentration of iron. Be careful, Creepers like to explore these hot regions
Deep in the snow between the mountains the coldest biome, bring some leather boots, or just go around it, they aren't that big