End potentials

End biomes - Biomes based on yellow and purple. There could be a biome much like a bamboo forest, containing nothing but the chorous flowers. The end could do with new tree types, much like in the nether, potentially introducing purple wood, which goes with purpur blocks. There could be both yellow and purple leaves on the purple trees. The dragon area should be its own biome type, potentially like a 'waste' area, with broken landscapes and pools of dragon breath, which can kill you. 

End terrain - The islands could use a more natural height difference. It would make it harder to navigate, but more natural. It would also be cool, if the islands weren't as flat, but had some height to them. The end stone in the terrain should be different textures.

End mobs - The endermite should be able to spawn from blocks, much like the silverfish or be a biproduct of killing an enderman potentially. In general the end needs a larger varity of mobs, which could be adapted to the biomes. I'd like a type of 'end monkey' in the 'bamboo forests' of chorous plants. It could throw chrous fruits at you, forcing you to teleport and swing from plant to plant. 

End blocks - I think adding one more block to the terrain would help with the variation of the terrain - potentially this could be a purple variant of endstone or a yellowish smooth basalt textured block.

End structures - There could be more variation in the different city types. Potentially in terms of the loot or the mobs there. Biome based?