Here is a flower bed that I took to Prairie Sisters with me back in April. I picked up the headboard on half price day at the thrift store--it was this color when I got it. I used a drawer for a planter and added some front legs.
And here is another fun thing item to plant in--a drawer attached to a shutter. This would also work great in a kitchen, hold recipes in the shutter, cookbooks or wine in the drawer. Or how about in a bathroom for towels, fun baby bath pictures in the shutters?