Did you know that John Flynn has precuts for the wedding ring? At least he did at Quilt festival, and i think he probably has the kits ready to go.
Shar Jorgensen has the templates in a kit that is Omnigrid, so you should be able to find it in a bunch of places.
I've started one with Shar Jorgensen's templates, and if it is anything like the rest of my quilts it may be a long time before it is finished!
Good luck