11.  High overhead, a jet left its vapour trail across the blue sky.

12.  I looked out at the brilliant blue sky.

13.  In the afternoon, I strolled back into town beneath a blue sky.

14.  Infrared film renders blue skies a deep black.

15.  It was a beautiful day with a blue sky and a gentle breeze.

16.  It was a glorious day with blue skies.

17.  Large white clouds drifted slowly across the deep blue sky.

18.  Looking up to the blue sky, she watched the many birds flying overhead, chattering and screaming as they passed out of sight.

19.  Maybe we shall have one of those text book days of gentle ripple, high cloud and blue sky.

20.  Moreover, the pretty paper kites in the clear blue skies still outnumber the documentary versions by a long way.