"Say "thank you" to your guests with a favor of a tree planted in their honor (arborday.org offers the service). Present the certificate tied to a fallen or dried leaf twig wrapped in burlap."
i LOVE this idea! what a way to give back to that special someone and to our earth that God so beautifully and wonderfully made! this would be a perfect gift for thanksgiving, birthday, loss, or to welcome a new baby!