I like these On The Edge Pots by designer Michael Hilgers. They are flower pots that can be hung over a railing, which is particularity nice to those of us with outdoor space limited to a balcony or fire escape. I find them a much more elegant solution than traditional window boxes. They look good from both sides of the railing and they can still still be used as non-hanging pots. On The Edge Pots are available for purchase from DWR for (ouch) $85.