How sorry. Did not receive any direct info from you.
I agree with your above comment. This is not easy to script. However, I think it is easy enough to tweak Minty theme. I only concentrated on searching and replacing these two rgb values (I left the alpha one untouched for the moment as I had only a rgb color-picker).
If you happen to know how to change the color of Firefox selected sub-items (still have green on them), I'll gladly take it.
Minty is already the most popular Cinnamon theme. It's very nicely built with a very good care for details. The only thing, it's limited to green color. I know a plain regex is enough to make a color change. Built around a control panel, it could give the user a choice of some colors, and of course a blank one where the user would add its own RGB values. My knowledge is too limited to do it myself but I think, sooner or later we'll get it on Cinnamon.