For a spring luncheon, I cut a bunch of ferns and placed them down the table.  Then I wrapped ceramic pots with a fern frond and tied raffia around them and put potted primroses, ranunculas, and miniature daffodils (so I could replant them after the party).  I put cut daffodils in little vases and scattered them down the center of the table.  I wrapped  the napkins with a single daffodil tied with raffia and placed a little bag of chocolates at each place setting.  You could use the same idea to decorate a buffet area for a party.