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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15votes
Cat dimension
15votes
End Deserts
15votes
Withered Biome(s)
15votes
(Sea biome) shallow coral reefs
15votes
The Mythos Dimension – Underground World Generation
15votes
La ciudad de las almas
15votes
Famous Real Places World (was: New world pack idea)
14votes
Soul River Biome
14votes
New Demension: Wyvernex
14votes
The deep ocean dimension
14votes
Phantom portals
14votes
The Marsh Biome
14votes
Haunted Forests!
14votes
Magic Mountains
14votes
The ruined biome
14votes
Giant mushrooms should generate in The Nether.
14votes
Sun City (Mesa biome)
14votes
heat and moisture map
14votes
Bioma de Néon e Seus Habitantes
14votes
Random parkour biome
13votes
End Forest and End Core
13votes
Nether Portal Corruption
13votes
The Flaming Sea (Nether Update Biome)
13votes
Make the new Nether Trees grow from the Ceiling as well.
13votes
Deadlands Biome
13votes
Diverse ores
13votes
McNether Update 1.15 or 1.16
13votes
Flower Biome should be less rare to find
13votes
Underground Forests
13votes
War Ravaged Biome