Rare variants of all mobs

I want there to be like a rare color variant of all mobs like the pink sheep and brown panda like make rare cow variants white with black and have like the yellow on bees turn green I would like it to work like when a mob spawns in it has a 1/10000 chance of being a rare variant and if you breed a rare variant with a normal it will be like a 1/5000 chance of being rare and if you breed two rare variants can be like 1/1000 we encounter thousands of mobs during our gameplay and I think most people would like to have these added it will make breeding and starting farms and exploring different biomes for different mobs more fun