Yesterday evening, I spotted this very simple, very pretty combination of black-eyed Susans and lavender on the corner of 18th and F Streets, not far from the Old Executive Building. The three small trees are crabapples.
Please click on the photo to get a closer look.
The planter is located along the side of a building occupied by The Council on Foreign Relations. Its facade is that of Michler Place, a home built in 1871 (the interior is from the 1980s).
ADDENDUM: Below is a photo of the planter in March 2012.