If you don't have an outdoor table, move one outside to your patio or deck. Cover with a tablecloth, or if the table is wood, a pretty runner. Green patterned plates draw the focus to the table.
Place simple flatware on folded yellow napkins. Hang lights or lanterns from the trees and arrange yellow flowers in clear vases. Green votives cast a welcoming glow on the evening. Write the guest's name on a piece of cardstock, punch a hole in the cardstock, slide on a piece of ribbon, and tie to the back of each chair.