I would go to the dollar store and buy a pack of sponges,cut one,or however many you need into 1" pieces and use some spray paint,whatever color you prefer and camo it up. I have paid for hydro dipping,put a dozen at least gun wraps on and painted a handful,including an 870 20 gauge. I like the sponge & spray paint way for a $ per what you get, imo. I just spray paint 3-5 different colors on a piece of cardboard and then dip sponge in and then go to town on gun.
The sponge spray paint job is the bottom gun.