Ok, here's an example of what I've got so far...this is the Swashbuckler ring.
I decided to go with a simple patterned ring for the con / implied portion. I repeated an edge from the class icon (in this case, the feathers atop the hat) in a circular pattern, then shrunk and mirrored it for the inside edge of the ring. This keeps the ring from being too plain while incorporating an aspect of the class icon.
Speaking of mirroring, you'll notice that the original images are backward; the client actually flips the ring graphics around in-game, so in order for them to look right when you're playing, they have to be reversed when the files are created.
