So I have 2 Deathtrooper sets. They are all assembled, and painted black. I'm going to hit the little green spots on the helmets, and do some highlights, but I'm looking for suggestions on how to differentiate the 2 units. As you can see below, for other troops, I've been able to incorporate different colors. The Shoretroopers have different colored arm armor, the Fleet Troopers have different colored shirts and pants, and the Rebel Troopers have different themed clothing.
But I'm at a loss on what to do with my Deathtroopers, and was hoping maybe someone here's got an idea I could work with. I don't want to do the rim of the base, I'm doing all of the Empire in one color, and all the Rebels in another color. I don't want something as subtle as just changing the dots on the helmet from green to something else, I want it to be easily recognizable from a distance while playing a game, just in case the 2 units are on the table, and are too close to each other to easily identify who belongs to which unit.