I'd already applied some lich's (modified to work for a humanoid) spellcasting animations to a skeleton a while back, so this is kind of an extension of that.
Zombies and skeletons can, in theory, use any kind of animation, and even wear the clothing, of humanoid NPCs. http://i101.photobucket.com/albums/m43/danburite/Zombie.jpg
I'm sure there's some that don't work properly (the Elven Cuirass looks kind of wonky, for example), but from what I can tell, for the most part it looks pretty good. There's some clipping, but being undead, we can just chalk it up to a torn robe or something.
Happy modding!