Do you mean like mecate reins on a rope halter? I've never seen them made from roping ropes they are usually pretty stiff.
Here is a site that has a photo of what I'm talking about. If its what you are looking for the rope halters are available in many places and the mecates the same. This is just the only site I could find with the combo pictured together. http://www.freewebs.com/lodgeropes/h...lessriding.htm