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

Vote for an existing idea or New post

4votes
World and Over, A new dimension.
17votes
Warped forests have a LOT of potential to be great (X-Post from reddit)
14votes
Withered Depths: A brand new Nether Biome
3votes
Sand Dimension
7votes
Simply unflatten the nether ceiling and provide late-game access
596votes
Deep Nether
11votes
Quartz Crystal Fields (New Nether Biome)
13votes
Creeper "Homelands"
33votes
(nether biome) fungus cliff side
22votes
Crying Valley Biome
6votes
Granite Forest (Spires)
1vote
Mini Nether and Overworld biomes in the End
15votes
Glowslime
7votes
Barren Plains nether biome
6votes
Netherwart Meadow
11votes
Warped Waste
13votes
Nether Oasis / Blight Field (Sub-biomes)
12votes
Nether Biome: Withered Bay
13votes
New Nether Biome: Gravel Graveyard
9votes
Nether, cliff curry caves
10votes
Obsidian Canyon
94votes
(Nether update) Thermal vents
4votes
(Nether Biome) Wither Dunes
4votes
Withered desert biome
9votes
Nether update: obsidian valley
42votes
(20w07a) Soul Sand Valley Vegetation
20votes
New dimension. Thule.
76votes
(Nether Update) Lava Spikes Biome
9votes
Nether Biome Variant: Crimson Grasslands
8votes
(Nether biome) Ember hills