A month after I got my truck back in 2004, some clown backed into my pickup/box, just aft the taillight. While it was in the bodyshop I took the valve cover off and had the shop shoot it body color "mineral grey metallic" it only cost me an extra $40 bucks. If you've got any body work or know any friends in the trade, have them shoot it body color for you, it really compliments the engine bay, people always give me thumbs up for the way it looks.
FYI The painted cover has been under the hood for 1. 5 years & over 37K miles and looks just as good as the paint on the outside of my truck. the brand of paint used to match my truck was SIKKENS i believe.
-Ryan