Posted: 05/11/2013 at 18:45
Well, you want something evergreen and very low.
Heucheras are mound forming in foliage colours ranging from purple black to red to orange to yellow. Ophiopogons are grass like plants, almost black in colour and evergreen. How about winter heathers? They have flowers in winter and green, yellow or orange foliage. Grasses like festuca ....blue foliage....uncinia reddish foliage and stipa Tennuissima with lovely summer flowers. campanula dicksons gold is a yellow evergreen mound with blue flowers in summer. Scabious like butterfly blue is evergreen with blue flowers all summer. Thymus silver Posie is a silvery white foliaged thyme with pink,flowers at about 8" high. You could move some of that gravel to other side of box edging to mulch your planting.
How,about a couple of terracotta pots under your bay window and plant Phormiums ....dazzler is a rich maroon red and more compact than most. I think, since your planting is quite formal, that I would keep to fewer varieties of plants. The pots would hide the crack on the wall.