Can you order lower parts kits that include colored parts, like safety selector and trigger guard? And any other parts that might look good in a color like foliage green?
I'm not sure about the selector lever but magpul makes replacement trigger guards in all their colors for fairly cheap, they are oversized and great for gloves.
I dura coated a LPK in desert tan once only on the visible parts just to see how it would look. It turned out pretty cool. Or coat the receiver and use black parts.