Judy Martin's "Monet's Wedding Ring" would be different than a regular double wedding ring---all straight lines. Eleanor Burns has a book out for the Lover's Knot
Her Day and Night quilt is beautiful too.
Just make sure and find out what size their bed will be and what colors they're going to have in their bedroom. After that almost any pattern would work other than Broken Dishes, Bachelor's Puzzle, or things like that. (LOL)