Recycle, reduce and reuse.
My husband and I built this out of left over deck railing. We had four equal peices of deck railing left over, so first we made brace boards for the corners out of some leftover 2x4's, inserted plywood in between the deck railing and the corner braces, then made the top with 1x6 deck cedar deck board. I also lined it with waterproof fabric on the inside, with no bottom there was no need to do the bottom. I plan to rremove the magnolia I have in the center and replace it with a Dwarf Alberta Spruce in the fall. Should be cute for Christmas!