Hi, the sky is so pretty and blue today. Blue is my favorite color. What's yours.
I really like blue as well. Especially blues that have an ultramarine shade, with lovely violet in it. 
There really are a lot of different shades of blue, that's for sure.
Very true. It's kind of cool that there is something called the Rayleigh scattering that causes the sky to be blue and the dark color of the sea. It's an optical effect of sorts.
I think it was first produced by the Egyptians who figured out how to create a pigment for their decorative arts.
I didn't know that, interesting. Another little fact, as my children have blue eyes, it's caused by from Tyndall scattering, which is light in the stroma of the iris.