A tomato cage can be used to create a fun and festive Christmas tree, even in the absence of traditional Christmas ornaments. To begin, start by choosing a tomato cage that has a sturdy frame and a large base to hold the weight of the decorations. Next, wrap Christmas lights around the tomato cage, starting at the bottom and working your way up. You can also add a variety of ornaments to the tree, such as small ornaments made from pom poms or beads, or even use candy canes as decorations.