Is blue a color of Santorini? -I would say, yes and no. Indeed, sky, water, and some roofs (or doors) are blue. But Santorini is much more than this. 🙂
My best friend, who is Greek, told me a story that someone was checking her passport and ask is she from Egypt… The Greek passport has beautiful pages with drawings of different ancient ruins etc. I still think that Greek temples look quite different from Egyptian pyramids. 😉