Visually Unique Skeleton Bones

It's kind of odd that any type of skeleton drops the same ol' bone, especially Wither Skeletons.

Now that Chickens can lay different eggs depending on the biome they spawned in, it shouldn't be too hard to make Bogged Bones (or alternatively Swamp Bones), Stray Bones, and whatnot, right?

Don't get me wrong, it could just be a visual thing. They'll just do the same thing as the original, but it'll make more sense logic-wise.