this is a cute idea for an rsvp - ask guests to respond in a creative manner on the sheet you provide. AND can double as something for people to look at during cocktails. it would be a risk that you wouldn't get a single creative reply.. but there are lots of fun uncles and aunties out there that would take advantage! i can see a few of them even writing out a silly poem: "roses are red. violets are blue. we wouldn't miss your wedding.. even if you wanted us to." for those who aren't able to make the wedding, this would be a great way for them to share their best wishes on a personal level.