Pot for December colour: White miniature cyclamen, Festuca 'Elijah Blue' and box. Photo by Sarah Cuttle. For a different Chistmas pot using box, try http://www.gardenersworld.com/plants/pots-containers/autumn-winter/pansy-and-box-christmas-pot-display/1149.html
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.