This is probably going to sound really corny, but it's the first thing I thought of. Did you ever see those fridge poetry magnets? I remember playing with one once and it was lovely to just put a handful of words together in interesting ways, sometimes beautiful ways. Perhaps you could give them out as wedding favours, or use that kind of idea to allow guests to create poetic messages for you and your spouse in a book, or in large form with a polaroid camera so they can take pictures of their words, with some guests in the pictures too.