Potted begonias on the tea house railing. You can see the cut-marks on the stones, as though they are still fresh from the quarry. ~WMG
Much more practical idea for a window box; the pots can be removed and there isn't a structure resting against the house itself (that is wet and full of dirt of course) which I've always thought must create other problems.
Jade Vine: The jade vine (Strongylodon macrobotrys) is a native of the tropical forests of the Philippines. Its flowers are the color of highly unusual blue-green jade, and hang in bunches up to 90 cm long; each clawlike flower is about 7½ cm long. The jade vine's flowers are pollinated by bats.