This is an idea.. A random one that I had, but it would be ABSOLUTELY FANTASTIC for texture packs.
Know how horses have a bunch of skins? What if every mob had multiple skins like this?
Ex. Zombie, you have an alex version of the zombie skin, perhaps some with it being.... slightly gory? I dunno... Perhaps it could be just the steve and alex skin, but have a few extra skin slots for texture pack makers
. this would make it a lot nicer for those who want to make adventure maps, or people who want more variety to mobs.
Perhaps just the ability for more mobs to have multiple skins would work out better.