BioBundle adds 31 new biomes to minecraft with there own distinct features such as custom structures spawning and custom mobs (soon).
The Deadlands: A biome filled with the bones of gigantic creatures.
Bushed Forest: A forest with bushes
Pillager Paradise: A lot of Pillagers
Gem Biome: A red biome that has large crystals coming through the ground and floating.
Blue Gem Biome: A blue biome that has large crystals coming through the ground and floating.
Green Gem Biome: A green biome that has large crystals coming through the ground and floating.
Large Pine Forest: Contains mega spruce trees.
Acacia Highlands: Very high place with lots of acacia trees.
Ruined biome: Phantoms roam this land.
Pine Highlands: Very high place with mega pine trees.
Volcanic Plains: A basalt filled biome.
Volcanic Highlands: A basalt filled biome with some erratic terrain generation
Stone Desert: A desert made from stone
Birch Highlands: I think you get the idea now. High place with birch trees
Mushroom Forest: A forest full of mushrooms.
Warped Biome: A purple biome with a warped terrain generation
The Wall (with two variants): Acts as a world separator.
Lava Plains + Hills + Highland
White Legged Spider: A different variation of a normal spider
Silk Thrower: A spider that spits webs at the player
Dark Ghast: A very small ghast which is black