Anne Cecilie's ring tutorial over on Jewelry and Polymer Clay Heaven is definitely spectacular. It features a snake eye (type of cat's eye) cabochon. I like how she used an adjustable ring base rather than a beaded ring band as an alternative.
Aleshia of Beadifulnights has some awesome beaded ring video tutorials some of which I have featured before (see link below). Her briolette flower beaded ring (and pendant) tutorial shows how to make flower rings with beaded ring bands. She demonstrates how different briolette beads can result in different looking flower rings.
I also liked her Trinity ring design which featured 3 floral elements. They add variety to the ring band but do not stand out like a cabochon one.