Do you wonder that Hindu God, Krishna, is colored in blue? Not, in green, red and yellow colors? The answer is here.

When there is no color, there is blue color, see the sky, it has no color, but out of its depth the blue color arises. See the rivers and oceans, they have no color, but "blue" color appears out of their depth.

Krishna is the representation of love and spirituality, to show the profound deepness of them, sometimes, he is colored in blue.