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.

Vote for an existing idea or New post

17votes
New Dimension with a Boss and new traders and armor/tool
17votes
Orange Leaf Forests (new structure, flower and potion effect)
17votes
The Ether Dimension
17votes
Glass Desert
17votes
Ender Swamp
17votes
Weeping Forest
17votes
Timeless Forest
17votes
Nether Oasis / Blight Field (Sub-biomes)
17votes
Nether update biome idea: Nether hotspring
17votes
Adaptive / Player Made Biomes
17votes
Nether Surface -- An incredibly harsh, Alien Planet
17votes
(Nether Update) Witherstone Caverns Biome
17votes
Ender jungle
17votes
Lakebed biome
17votes
Infested Forest [New Nether Biome]
17votes
Make the new Nether Trees grow from the Ceiling as well.
17votes
Deadlands Biome
17votes
Boglands, a new biome for the nether
17votes
river logs
17votes
Nether Deserts
17votes
Dynamic Chunk Height
17votes
More Shallow Waters at Beaches
17votes
New World Generation Option
17votes
Biome Variation (beach): MARSHLANDS
17votes
Igloo villages
17votes
"Edge" biomes like Jungle Edge should be larger
17votes
(Sea biome) shallow coral reefs
17votes
The Mythos Dimension – Underground World Generation
17votes
Abandoned War Site/Junk Biome
17votes
Famous Real Places World (was: New world pack idea)