PS:T:EE - change colors of texts to something less in-your-face?

Is there a way to change the colors of texts in PS:T:EE?

I'm trying to get accustomed to the game to FINALLY play it, and the typography is really hurting my eyes ...
i was able change the font already, but the harsh, pure colouring with bright yellows (like item descriptions), greens (game saved messages, ...) and reds (getting hits) is so "non-fantasy" style to me that i'd like to change it to something more toned down colors.

Thanks for any help ... i've never done UI-modding by myself, but i'm generally able to do such thinks with some pointing the way (like telling me the keywords and syntax ...)