For my first attempt, I chose a stripey Jacob top from Hobby Knob Farm and wrapped it with hand spun mohair carded with a little glitz. Two things. One, if you use a hand spun wrap, be sure to spin your yarn in the opposite direction from the handspun. I spun the mohair counterclockwise, or S, then spun my yarn clockwise, or Z. Two, it is really, really, really easy to overtwist this yarn, and don't think you'll fix it by spinning it back the other way once you are done. You will not fix it.
For my second attempt, I dyed a batt of Jacob, also from Hobby Knob Farm but blended to a uniform gray and wrapped it with a commercial mohair blend. I think I mastered the twist in this trial, and I've got enough for a hat. YAY!