31.  Thick white clouds raced across the blue sky, casting a perpetual kaleidoscope of light and shade over the earth.

32.  We watched birds soar in the blue sky above.

33.  When she woke in the morning, it was to clear blue skies, and she gave a sigh of pleasure.

34.  There were swallows in the cloudless blue sky.

35.  Against a deep blue sky or dark storm-clouds, you may need to reduce the exposure.

36.  ...warm sunshine and clear blue skies.

37.  ...a vivid blue sky.

38.  ...two days of clear sunshine under peerless blue skies.

39.  It was a lovely afternoon with a blue sky and a few fleecy white clouds.