Here's what I really wanna see! These two done in the style of the first few castle sets with big crosses on their chests and shield!
Here is two pics of celtic shields, one in action, the other an artifact. I hope to get better. I think the best for torso would be one that has the ends of a silver or gold torc on top of chain mail or something.
Here's the Holy Roman Empire Eagle.
This is the English Four Quarters ( I don't yet know heraldic terms).
I guess the proper term for this is lion rampant, gold may be best color for this.
Here's a pic of a possible Roman shield design.
I will try to get more and better examples as we get more ideas, hope this helps.