Yesterday, I primed the completed models, and took the following pictures. I apologize for the quality, I took them with just my phone.
As far as making them look more Imperial, I've added a few purity seals and scrolls, they'll hopefully show better once they're painted. Another thing that the paint will hopefully solve will be the issue of the the shield design, which as
Savageconvoy pointed out, looks more Iron Warrior than Ecclesiarchy. Do you think using green stuff to fill in the teeth and eyes on the skulls might help it look more Imperial?
I'm thinking a mostly dark green paint scheme with gold metallic trims, sort of a Green Knight feel. For lore I was going to say that they come from an Imperial world that is at a medieval level of technology for the most part, which would explain why the warriors who come from it fight with sword and shield in a galaxy of bolters and lasguns.
Unfortunately, the painting is going to have to wait for some months, as I'm heading back to college this week, and I can't bring all of my hobby gear. I'll try to get some work in during winter break, but until then, I look forward to reading what you have to say.