I did an arrangement/mash-up of "Without You/I'll Cover You" for a friend's wedding. It was for three female voices, piano, and string trio, so it probably doesn't help you, lol, but maybe it will give you an idea. I'm trying to remember, though, I think that might have been performed at the reception. For the walk down the aisle I arranged "Sun and Moon" for the string trio; that would sound really pretty with solo piano.