At the local GoodWill, mailboxes are stacked in the back, waiting for some TLC and a bit of paint. Just shows that a bit of imagination goes a long way toward repurposing. Helps to have a container so deep, for good roots.
A spilled flower pot is the perfect idea of bringing a little whimsy to your garden. Just tip Southern Patio's 22.5" Natural Oak Whiskey Barrel on its side, plant bushels of mums, and you have your own spilled flower planter. http://www.southernpatio.com/products/planters/hdr-012221-22-5-hdr-whiskey-barrel-natural-oak/