To "Hollywood" a ramrod (as I call it), take an old bed sheet & tear a long strip about 1.5" wide, fold the edges in to the desired width you want the stripe to be. Or go to Jo Anne Fabrics or HobbyLobby and buys some cotton Binding of the width you want, color doesn't matter.
We the material, tape one end & turn & wrap the RR the spacing you want, tape or wire the other end. Take a propane torch & scorch the wood as you turn it.
Remove the material, sand, stain, finish.
My suggestions is practice on a dowel rod before screwing up your good RR.
I have done several of them, every one I sanded off later. IMHO, the striped RR distracts you from the looks of the rifle & makes the RR the focus point. Now if that is why you want it, it is a good distraction. However if you want someone to appreciate you rifle building skill, rather than you RR skills, don't stripe the RR. Make the RR so it is part of the rifle & belongs there, not the focus point of the build.
Keith Lisle