I know it's still a little cold to be thinking about planter boxes and spring time, but I'm quite smitten with this Element planter box from Planterworx. Each planter is hand made from powder coated aluminum in Brooklyn and available in three standard colors. They are available in a variety of shapes and sizes as well. Pricing seems to be very reasonable considering the product.
p.s. In case you were wondering, that is a photo, not just a rendering.