blue skies are really nice in the summer
This effect is called the Rayleigh scattering, it causes also the blue that you see in the sea. 
Interesting.    Do you prefer clouds?
No, I am a fan of blue, it was an important color for decoration in ancient times. 
In Rome or Greece?
In ancient China, artist were using cobalt to color porcelain. 
Art was very important in that era.
Also in ancient Egypt, they used Lapis lazulis to make blue jewelry.