Slip the garland-covered tomato cage around the mailbox post. Then, add twinkle lights to the garland, starting from the top and working your way down to the bottom. An extension cord will be needed to power the lights.
Once the mailbox is transformed, create a small grouping of trees following the same steps. Note: You can skip the first step; the remaining trees don't need to be cut since they'll be standing on their own.