Posted: 22/04/2013 at 12:49
How about a weeping tree?
Pyrus salicifolia , the weeping pear. Nice grey green foliage
Or a large shrub....cotinus royal purple has wonderful purple foliage and is easily pruned to,size
Not too many trees will stay at 5' or 6'
Evergreen shrubs or deciduous shrubs or maybe an ornamental grass