Upside down biome in the end

I want a specific biome in the end where gravity change, and immediately gravity go up and you go upside down, and all structures (end cities) and islands are upside down,  in this biome it could have especial upside down endermans and especial upside down fruits, with this fruit maybe you can cook and like corus fruit craft a new block, this new block could be the especial block to build the end portal where you want. 

Also it could be great if there are new colored trees, we have brown, red, white,orange, red and blue wood, maybe this biome could have yellow and green wood and yellow and green mushrooms.