Well as they as a unit concept are drop troops I don't think hey would worry too much about blending in, screaming in from the sky doesn't lend itself to stealth.

so I think aside from the stealth or infiltrators you could really go for a bright pop on them.Almost the opposite of raven guard.
Something like all white armor, with a dust or sand colored lining/wash In the cracks. Then black fatigues, and details for the model in light blue or sky blue, ex. The goggle/glasses.