Recently got a bunch of these lovely Iron Core guys and girls, and have been trying out a few color options on them. This is what I've got so far. I'll probably keep rolling with that theme going forward, although the stripe on his shoulder will likely change color to denote the model's combat role (e.g., yellow for gunners with the chevron specifying gun type).
The goal is to put together a universal enough KillTeam squad that I could hopefully run as multiple different Counts As units in casual home games.