I'd been debating what I was going to do and will have a post at some point to share my plan. Small as this 'army' is it may well be the antagonist for my wider parade... other than that I'm out of ideas.
I am hoping to mage these as Grimdark and grungy as I possibly can - to stretch myself. I'm using my Blood Bowl Rotspawn as a starting point [maybe not with the threads though].
They will be tar based, like the blood bowl team, but I'll be doing the odd rock as red, to try and fit in with my Red Planet BASE. The rims will be black though...
Anyway, because the tar bases have to be done at the very end but they have been built for quite a while and could only be primed after adding the stones and odd bit of dead foliage so I'm still giving myself a Great Big Big Build Base BLESSED VERDIGRIS Stamp of Approval.