Great place to shoot a mouthwash commercial. :^)
The roofs of many buildings in Santorini have that kind of impact as well.
One explanation for painting everything blue there is that it creates a psychological sense of coolness, in a place where it gets so hot.
(I’ve heard that in the South of the US porch ceilings are often painted blue because it causes the bugs to fly up there, and not bother you while you’re sitting on the porch...and ‘bottle trees’ used blue bottles to attract bad spirits...)