Steve,  You are not alone on the napkin rings. I have made several sets in different woods and they have been popular gifts. To make them I first cut the pentagram out on the band saw from 1" wood. They using a jig and a forstner bit on the drill press I cut out the center. Then I mount them on the lathe using  a 4 jaw chuck and the 1" jaw set that grips through the center hole. I round over one side then turn it around and round the second side. Finally they are sanded and finished. I think it is the pentagram shape that makes them somewhat unique.