Please read the pinned post on creating new biomes and dimensions. Remember that individual items, mobs, and structures should still go in their own categories - this is not a category for entire updates.

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1301votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
4926votes
(Dimension) Sky lands under review
2623votes
Biome: Magic Forest under review
34votes
Lava Sea temples in the nether
2votes
New Nether Biome: Inferno Moors/Craters
3votes
Damned biome.
12votes
The void dimension (Updated)
2345votes
(Swamp) Fog under review
79votes
New Dimensions
2votes
Snow Biomes Overhaul
3votes
Deepslate generation mechanic
8votes
Spawn in Nether in the start of game (not respawn!)
1vote
quick Sand so one you sit on the sand you sink
3votes
New Nether Biome: Smouldering Dunes
3votes
MoreShrooms
2977votes
Sandstorms under review
1vote
Ravagers rarely spawning
0votes
Lush Forest - Variant of Lush Caves
3votes
Dark Oak Forest Update Concept
2votes
"new biome" scary woods
142votes
Minecraft Dungeons Biome in Minecraft!
0votes
Glacier iland
179votes
Aether dimension
3votes
Tree Update Concept
4votes
Seasonal biomes, without changing seasons
1vote
Volcano Event
3votes
add new biome to the nether
3votes
Custom Dimensions For Java
404votes
City Biomes
1vote
Coastal Village Seed