Dotsie, I don't remember what the default color scheme was, but I do remember that we were able to go into our preferences and change it individually - we had a choice of several different color schemes. Mine was a green and yellow combination, the easiest on my eyes of the choices available.

That sort of thing should be fairly easy to add. I think the color schemes come in pre-programmed modules and the techies can just add the ones they want to a drop-down list in the preferences section.
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)