sub-variants of mobs

We all know that we have hot and cold variants and biomes for various mobs, but I've been thinking that adding small sub-variations for each mob would also add more dynamism to adventures and discovery. Just as horses have numerous colors and variations, I think adding at least 3 sub-variants for each type of mob would be ideal. *example: *Zombies and skeletons (all zombies and skeletons have the same clothing palette, and even the variants have no differentiation between them) *My idea is to add clothing variations for each type of zombie and skeleton. *creeper *Add some with darker shades of green and others with lighter shades. *cows add spots between the variants *These were just a few examples, but I imagine the ideal would be to have one for everyone. It wouldn't add any changes to the original mechanics, it would just give them more personality and make each mob truly unique. ( Some minor texture changes from mob to mob would make each encounter truly unique between player and mob. )