Anyone notice their nipples/areolas change color?

Rainbow
For some reason I just remembered this. Before getting pregnant my nipples were like a dark pink/orangeish color. And then when I was pregnant they turned DARK brown. Like hella dark. And now they're somewhere in between. I honestly liked them when they were brown though! Guess I need to get pregnant again haha. 
 I read that they become darker so your baby can find them easier. Isn't that crazy?