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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32votes
(Nether Update): The Blazing Hollows Biome
32votes
Nether Biome:Ghast Geyser Biome
32votes
Ash Geyser Biome
32votes
Rare Nether Biome: Greed Islands
32votes
Parasitic Warped Forest
32votes
New Hot Biome: "Tropical Wetlands"
32votes
Obsidian Spikes biome for the Nether.
32votes
Valley Biome that generates in the middle of Extreme hills / Mountains
32votes
There should be "ore chunks" where certain ores generate more
32votes
Islands change depending on the Ocean Biome/Temperature
32votes
Potion Fountains or Waterfalls
31votes
Hot water.
31votes
Dried Up Ocean
31votes
Magma Spikes Biome (For the Nether Update!)
30votes
End Update Mostly Aesthetic
30votes
New dimension. Thule.
30votes
Shattered Savanna Biome Parity
30votes
Dead Volcano biomes
30votes
Phantom sky ruins with mother phantom boss
30votes
Infected Biome and Irradium
30votes
(Biome) bioluminescent underground mushroom isle/swamplands
30votes
Wither dimension
29votes
Lava Sea temples in the nether
29votes
River Deltas
29votes
Birch Forest Biome Overhaul
29votes
We don't need more dimensons
29votes
Frosted Mushroom Island
28votes
The crossroads biome
28votes
The Bone Quarry (and other Soul Sand Valley variants)
28votes
Wastland biome needs info