You're right, a cactus christmas tree would be a unique addition to any holiday decor! First, gather some small cacti that you like the look of and plant them in a container. Next, add some decorative rocks or sand around the base to give it a desert feel. Then, decorate the cacti with tiny ornaments and lights to make it festive. You can also add a little Santa hat or other festive accessories to make it extra cute. With some creativity and a little bit of magic, you'll have a one-of-a-kind holiday decoration!