These plant containers in the shape of cubes and rectangles totally make this room with cube like club chairs and a square coffee tables.  The containers are eco friendly fiberglass Earth Wall and Earth Cube lines from Architectural Supplements painted in silver.

 Above: Earth Walls with Aglaonemas
 Above: Earth Cubes with hardy, dramatic, and geometric ZZ plants.  Note that the full name of the ZZ plant is Zamioculcas Zamiifolia and it originates from Southern Africa.  It is very popular with designers because of its angular lines.  Here is a a great site to learn more about ZZ Plants and how to care for them: Epic Gardening.