As in the shoulder armor.Like one is green and one is Red.
You can do that allready.
On the Avatar menu, one of the squares will simply say "Symmetry[]"
the '[]' is a checkbox. Click it off, and then when you paint body parts, they no long paint symmetrically.
So, if you paint the left leg blue, the right leg stays the previous colour.
I'm pretty sure that the Symmetry options work on Shoulder Pads.