I immediately thought of the Lovers' Path Tarot, both because of the theme and because of the deep, rich colours.
Depending on the wedding, I would also think of the Botticelli (not always "nice" images, but those golds look amazing in an autumn light), the Enchanted (but I might only think of that because I have seen a LOT of 1910' and 1920'-themed weddings). I also like the idea of the Hanson-Roberts or Hezicos because the style makes even the "bad" cards pleasant to look at (I guess you wouldn't want to scare the guests who don't know about tarot !).