I love the color blue!  I have painted all of the rooms in my house that color, with matching blue furniture!
Are they all the same variations of blue? I would hope they would be different hue's and such.
Yes, some are indigo blue, some sky blue, and some are robin's egg blue.
Lactarius indigo
Lactarius indigo, commonly known as the indigo milk cap, the indigo (or blue) lactarius, or the blue milk mushroom, is a species of agaric fungus in the family Russulaceae. A widely distributed species, it grows naturally in eastern North America, East Asia, and Central America; it has also been reported in southern France. "L. indigo" grows on the ground in both deciduous and coniferous forests, where it forms mycorrhizal associations with a broad range of trees. The fruit body color
the Prophets are painted.
All frescoes were made in the same style. Most likely, they were made by a group of painters, two of whom were the principal ones. Sky blue, red, and yellow colours dominate. There are also some colour variations, including the usage of white colour, which are not typical for Eastern Orthodox frescoes of the time and only have some parallels with the Byzantine painting, which gives a hint that the painters were Greek.