One way to decorate for Christmas without a tree is to create a wreath using holly, pinecones, and ribbons. You could also hang stockings on the mantle or a door frame, or use paper snowflakes to create a festive display on windows or walls. Another option is to set up a nativity scene with figurines of the three wise men, Mary, Joseph, and the baby Jesus. You can also put up lights and other decorations around your home, such as a Christmas village scene or a menorah for Hanukkah. The possibilities are endless!