Here's an "honour guard" element for the Alien Warrior Caste army. The idea is that command stands in that army have guard units formed either of monstrous aliens with heavy weapons (in which role the old Tyranid warrior will serve) or primitive alien fighters (these orcs).
Very quick painting with contrast paints - as with the others, the base isn't finished but will do for now. I'm going to finalise the bases by aping the rocks on our terrain mats and applying a final drybrush.