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
Demon dimension
18votes
Village World (was: New World)
17votes
Rename the “Soul Sand Valley” to the “Shrieking Valley”
17votes
Apple trees
17votes
A dimension where you can get your dead pets back
17votes
Olympus/Heaven dimension
17votes
Tropical Rainforests
17votes
Raining Mushroom Stew in Mushroom Island Biome
17votes
Carbon dimension
17votes
Connecting ravines
16votes
Basalt hills biome for nether update
16votes
An Actual Swamp Update
16votes
Slime cave biome
16votes
Biome: eucalyptus forests
16votes
Igloo villages
16votes
Dark Jungle biomes
16votes
A new mountain biome
16votes
Abandoned War Site/Junk Biome
16votes
Ruins Biome
16votes
"The Illusion Realm"
16votes
Inverse Dimension with Nova Boss (was: New dimension and boss)
16votes
Haven
15votes
Magma Spikes Biome (For the Nether Update!)
15votes
Lake Biome
15votes
New dimension: moon
15votes
river logs
15votes
The Fair Forest
15votes
Cat dimension
15votes
End Deserts
15votes
(Sea biome) shallow coral reefs