The double wedding ring quilt is, imho, the classic wedding quilt.
Now, I must admit I have never done one and the curves intimidate the heck out of me. However, there are several templates available to make it easier.
these are from a google search:
http://www.softexpressions.com/softw...s/RingBind.php
http://www.ardcotemplates.com/dww-instruct.shtml
http://www.amazon.com/Double-Wedding.../dp/0486271420
I forgot to say congrats on the great day and I am sure they will love anything you make for them. :D