Please read the pinned post on creating biomes and dimensions. Please put items for the new Mountains and Nether Updates in their proper categories. Remember portals are structures, that includes Nether portals.

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637votes
Ready to talk biomes and dimensions? Here's how to do it! (Start Here) Pinned
1vote
monster town
1vote
An idea for the end.
1vote
Bulan
8votes
The Jungle Update: Jungle Terrain improvements
13votes
New Biome: The Gloam Cavity! [Nether Update]
1vote
Green Netherwart Forest
3votes
Dead Under Water Biome
2votes
Disfigured portals.
3votes
The tiny portal
3votes
Inverted colour biome
15votes
Dried Up Ocean
23votes
Nether Biome: Obsidian Shores
13votes
Biome for the nether:Wither Camp
14votes
Nether Vegitation
3votes
Mountain Nether Curse
2votes
idea for the savannah biome
11votes
Final Edge biome
9votes
Decayed depths (nether biome)
17votes
Soul River Biome
5votes
Temple of Midnight
30votes
(Nether Update) Withering Vents Biome!
6votes
Floating Mountains and Chasm Islands
4votes
Lava Lakes in Plains Biomes Slowly Create a "Praire Fire"
2votes
Erosion noice map for mountain gen
6votes
Magma Pit (Nether biome idea)
6votes
Clay Flats
11votes
(Biome) Nether Roof Biome
15votes
Ghast Peppers - A new Nether crop
10votes
Fantasy Dimension for the Future: Ascendance