I love this color combination in the garden. We went to a spectacular open garden tour today at a couple's house a few towns over from us. There were many, many azalea bushes throughout the gardens and I liked the Spanish bluebells against this white azalea.
Wow - this is just gorgeous - your azaleas are still in full bloom - ours are gone - love the bluebells with them - never seen anyone plant that combination - can't imagine why not - if they saw your picture they'd be all over here!