I have a bunch of different child themes available on my forums in this section: https://forum.frumph.net/viewforum.php?f=19
In the Easel Options there’s a disable default layout, which removes all the layout colorization that is on the theme to just be a blank black and white color set.
If you use one of the different child themes you could modify the color scheme via the style.css in the child theme (or) if you keep the default enabled you can enable jetpack’s edit CSS option (then an Edit CSS menu option will appear under the Appearance section)
Which will let you do ‘overrides’ of the current color scheme by putting your replacement CSS there.