My favourite colour is blue! :)
You aren't the only one who likes blue, it has been used in all sorts of art since ancient times.
Yeah I love the way it looks, especially the ocean blue colours. 
Natures blues, such as clear daytime, or even the deep ocean only appear blue due to Rayleigh scattering.Which is a fancy way of saying optical effect.
Wow that is pretty cool! What else do you know about this colour?
Blue also happens to be one of the primary colors, and due to this is a part of painting and colour theory.
Wow, do you know any famous paintings that use the colour blue?
Many of Van Goghs painting during his "Blue period" featured it primarily .