When I was a kid, knowing the answer to this question was important:
"What's your favorite color?"
I always answered "Blue!"
Nowadays, I like all colors and I take pride in having an infinite number of favorite colors simultaneously. If you ask me today "What's your favorite color?" I will answer: "YES!" (But I still like blue quite a bit.) Here are some predominantly blue sketchbook pages --mostly recent work but a few date back further.
This book, as a matter of fact has a lot of blue in it
(but that's another story!)