If you want to attach a lightweight object, brass rod is OK, but bending it into the desired shape causes fatigue and weakening of the rod. For general purposes, I suggest using spring-steel rod, aka "piano wire". It is available in several diameters from hobby shops appealing to radio-controlled model builders. My favorite diameter is .032", because it bends easily using two pairs of longnose pliers, and it is strong enough for most applications. For a heavier object, such as a gun, use heavier rod.
In any case, I suggest covering the visible segments of your rod mounts with shrink-tubing, available from the electrical department of a home-improvement store, Radio Shack, and wholesalers of electrical and electronic components. The tubing provides a pad and can be painted any color using acrylic gouache, aka acrylic airbrush color.
John is right, I do offer
starter kits for Formed Rod Mounts and Clear Film Mounts.