To make an outside Christmas tree, you will need a few supplies. First, you'll need to find a suitable tree, preferably a pine or fir tree that is at least 6 feet tall. Next, you'll need to gather some lights, ornaments, and a star or angel topper. Then, you can begin decorating your tree by wrapping the lights around the trunk and branches, and hanging the ornaments on the branches. Finally, you can place the star or angel topper on the top of the tree. And voila! Your outside Christmas tree is complete!