Camouflaging Your Gun
Painting your rifle is an easy DIY project that makes for a great off-season activity. Spray painting a gun is virtually impossible to foul up for the simple reason that there’s no such thing as a right or wrong way to camo a gun. From the article "DIY: Camouflaging Your Gun."
After you have a base coat, come back to accent the camo job with some sort of overlay. Two of the best overlays are vegetation (leaves) or a netting material. The overlay is a "reverse" pattern in that you paint the gaps or holes in the overlay.