Although the Nether biome is a hot topic, remember that items still should be put in their proper categories, even if they are Nether related. 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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8votes
The withered nether biome
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Green Netherwart Forest
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(Nether) Glowing Plains
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Magnolia biome
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Flameing Spikes Biome (Nether Update)
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Dry Tundra Biome
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Rivers In The Nether (Prevents Shriveling. Nether Update)
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Redstone Dimension
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The Future
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A Secret Dimension
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Charcoal Forest, Crisps, Temple Of Embers
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New small dimension accesed from the nether
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New Nether Biome: Cursed Cave
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Bats in the Nether Upate
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update the end to
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The "ultimate​ dimension"
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bushes on swamp instead of trees
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Late game mining/exploring.
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The Negitive dimension
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Canopy Generation: The First Layer
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Gravel "traps" generating on cave ceilings
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Frozen Fossil biome under frozen ocean / ice biomes?
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The darklands
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Dark Biomes (Overworld)
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Biome:Cursed forest
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Separate grass and leaf colors for biomes
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Slime Catacombs
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Madagascan Spiny Forest biome
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Biome locator: Using Biome Pictures
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Core of the Earth