Whether you would like to customise the surface of a gun, a car, or anything else with a snakeskin print, the procedure is about the same. There is an easy way to get the small diamond shapes distinctive of realistic snakeskin into the paint job. Use natural colours, such as variations of greens, browns and golds, or neon colours if you don't want to go for the natural look.
Paint the first colour on the entire surface where you want to paint the snake pattern. Apply the first colour with a sponge paintbrush to avoid brush marks, using spray paint. The first colour you lay down will be the colour of the lines around the diamond shapes of the snakeskin print, so choose the colour accordingly. Appropriate colours are dark grey, dark brown or black. Wait 12 hours for the paint to dry.
Lay some netting over the surface you painted, pull it down tight and tape it around the edges with masking tape to hold it down.
Shake some brown or dark green spray paint. Spray evenly, about 1 to 2 feet directly above the netting, and spray random areas in irregularly shaped spots. Shake up a different colour, like tan or dark gold, and go over the spots that you didn't get with the first colour. Go back and forth with the two colours to get a multicoloured, natural snakeskin look. Wait 24 hours for the paint to dry all the way.
Remove the tape that holds the netting and lift the netting up from the painted surface. You now have a surface with a snakeskin pattern.