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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18votes
Ice Caves
18votes
Biome: Roofed Ocean
18votes
Underground jungles
18votes
Oceanside Cliffs
18votes
River Deltas
18votes
Demon dimension
18votes
Village World (was: New World)
17votes
A dimension where you can get your dead pets back
17votes
The Fair Forest
17votes
Dark Jungle biomes
17votes
Tropical Rainforests
17votes
Raining Mushroom Stew in Mushroom Island Biome
17votes
Carbon dimension
17votes
Abandoned War Site/Junk Biome
17votes
"The Illusion Realm"
17votes
Connecting ravines
16votes
Nether Biome: Obsidian Shores
16votes
Fairy Forest Biome
16votes
An Actual Swamp Update
16votes
New dimension: moon
16votes
Slime cave biome
16votes
Igloo villages
16votes
A new mountain biome
16votes
Ruins Biome
16votes
Inverse Dimension with Nova Boss (was: New dimension and boss)
16votes
Haven
15votes
Ghast Peppers - A new Nether crop
15votes
Lake Biome
15votes
river logs
15votes
The Forgotten Biome (Contains Dinosaurs)