DIY tall square planters, I would cut the supports/frame pieces a little shorter depending on what you will plat. That way to soil will sit above them and they won't be seen. Especially if you are planting topiary's.
These all-weather planters are classic and can be used year-round. They would look great as a pair flanking the front door. I would add low-maintenance greenery to my porch with a simple boxwood topiary or a small spruce tree.