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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25votes
Islands change depending on the Ocean Biome/Temperature
25votes
Mediterranean biome
25votes
Forgotten Realm
25votes
The Map Makers Dimension
25votes
(Part1/3) Hot Springs Biome, Geysers, New Ore, A New Mob (The Vapor), and More
25votes
Frosted Mushroom Island
24votes
We don't need more dimensons
24votes
Another version of The CORE
23votes
Witch demension
23votes
Milk dimension
22votes
Obsidian Spikes biome for the Nether.
22votes
Cave Biomes (as a concept)
22votes
Beach update
22votes
End Islands sometimes generate at different heights
22votes
Separate Jungles into Jungle and Deep Jungle
22votes
Nether Additions: Cursed Villagers, Etc. (More cursed stuff)
22votes
CORE dimension
22votes
Throwback biomes/Dimensions
22votes
Wither dimension
21votes
real waterfall
21votes
Rocky beaches
21votes
The Dead Forest Biome
21votes
Phantom sky ruins with mother phantom boss
21votes
Willow trees
21votes
There should be "ore chunks" where certain ores generate more
21votes
Birch Forest Biome Overhaul
21votes
Update Magma needs info
21votes
Special shipwreck seeds
21votes
Colour Dimension