Even when the holidays are over, this arrangement can extend the season’s charms—and its fragrant greenery. Just snip some branches off the Christmas tree before it heads to the compost heap, and place them in a vase. To offset the fir’s stiffness, add cedar and seeded eucalyptus. Finally, the luxurious touch: a few dozen white tulips from your florist. Voila—a fresh display to welcome the New Year.