Is there any way to set the header\'s background color or background image for a particular static page?

Hmm I figured it out myself.
The problem was that the default site-wide background header color (in theme options) was overriding the header color I set set for the page using the 'skin color' option.

To fix it I had to add a few lines to the partials/part-cat-options.php around line line 205

#mgm-header-opacity
{
    background-color:' . $category_color . ' !important;
}

Hi,
No problem.
My earlier changes actually ended up causing a lot of side-effects on other pages.
I have updated my above reply with the correct changes.