40k WIP: Muties! Count as Orks

After playing with my Ork Allies in my Beerhammer match, I decided it's time to get cranking on my Muties!  The Orks were a great addition to the force, so I can't help but to make more.  Here are some of the mutants that I have made so far:

I'm not sure what the Muties will scream instead of Waaaagh!  but I'll have to think of something... Suggestions?