To make a Christmas tree out of a tomato cage, you will need the following supplies: a large tomato cage, green Christmas garland, string lights, Christmas ornaments, and a star or angel topper. First, start by wrapping the garland around the tomato cage, starting from the bottom and working your way up. Secure the garland with the string lights, wrapping them around the cage as you go. Once you have reached the top, place the star or angel topper on top of the cage. Finally, hang the ornaments on the tree to complete the look!