Amy's wedding was on a farm outside Savannah, Georgia, and admittedly it was intended to have a barefoot-in-the-grass feel. As I understand it, her mom and friends did the flowers.
A few magnolia branches were tied together for an understated (yet stunning) bouquet. On tables magnolias floated in bowls, and scattered around were big tubs filled with voluptuous peonies and roses. I'm sure you've seen things like this before. Still it never hurts to be reminded of the incredible no-fuss arrangements that can be done with "backyard flowers." I also think some of these ideas could translate to a graduation party.
Later in her Los Angeles home, Amy propped her own photo of a magnolia above the fireplace.
Images one through three are from Shabby Chic: Sumptuous Settings and Other Lovely Things and image four is from Martha Stewart.