Hydrangea paniculata Limelight, large white blooms tinged with pale green; trailing Ivy at the base spills over the sides of the classy zinc planter boxes. Baltic Ivy (variegated creamy edge) would combine well too.
Elephant Ear and Asparagus Fern make a great plant combination for a container garden-and they're both easy to grow! I know the asparagus fern is easy to grow inside, but need to look up other (Longwood- always worth the trip).
An example of using containers to create a typical hedge. Instead of plantings these boxwood straight in the ground, they are higher up to block views, and can be moved if necessary. - Gardening For Life
Aechmea 'Dean' and Dichondra 'silver Falls' in large containers in reflecting pool at Chanticleer Gardens. Design by Chanticleer horticulturist Dan Benarcik. Photo by Chanticleer photographer Lisa Roper.