Yes, it was obvious that the icons are clickable, and I did see the color picker - but it was a very simple color picker, just a grid of color tiles. Now that you mention it, I realize that there is a second, more advanced color picker, available behind the "+" button in the first picker, and there I can type in hex. I am guessing that the features of the color picker are determined by the browser, and not by your site?
If you click on the color pallette icon, that brings up a color picker and you can choose any hex.
Is it not obvious that the icons are clickable?