Can you add new biomes to the end

For example like a Biome with pink trees and new plants That can only be found in end or like multi colored translucent plants That can glow in the dark or a Biome with really tall tree's that have purple wood and black leaves and a sticky substance that drips off them, with a shiny reflective ground their that looks like water and were these shadow people live who attack any trespassers unless you have something to trade them. And another Biome can have these lights that can change color and trees with white wood and leaves that change color depending on the time in the over world