Passive mob "domestication" (a different skin based on whether they spawned or were bred)

With the addition of more and more cool wild animal mobs, our classic passive mobs start to look a little out of place in the world. That's why I suggest changing the skins of naturally spawned chickens, sheep, pigs and cows to Red jungle fowl, Mouflon, Wild boar and Aurochs respectively, as these are their wild ancestors. This would be a quick way to add some more cool looking wild animals to the world.

The old skins should then be applied to any baby you will breed or hatch from these mobs, as a simplified representation of domestication.

This way you can have the farm animals in your farms while having wild animals in the wild, without having to add or change mobs (AI).