New models...ideas?

These guys don't really fit with any army I have, but they look damn neat. The undead meets cyber hound aesthetic is cool. 

 Could and probably would use these as beasts of Nurgle. They would work and look way better than the current models.

A better looking and posed Sarge Harker and his heavy bolter.

A sweet Haemonculus or Urien swap. Maybe a better Fabius Bile? Almost too damn cool to to use for something.