Ok, here we go. You can re-label the gammagroup ID as "Good Ol' Windows" or whatever you like.
The color value for the original classic skin green text is -4096, 1024, -4096. I was able to change the "LED" color, the main (scrolling) ID window, and the text for the Playlist Editor and Media Library as follows. You can paste this entry into your color-themes.xml file and as I mentioned, name it anything you like.
<gammaset id="*Default">
<gammagroup id="plastic" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="display" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="goldbuttons" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="greybuttons" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="greybuttonsbolt" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="multicolorbars" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="txtlabels" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="titlebarstripes" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="ledcolor" value="-4096,1024,-4096" gray="0" boost="0"/>
<gammagroup id="display-scrollbar-bg" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="display-sui" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="display-text" value="-4096, 1024, -4096" gray="0" boost="0"/>
<gammagroup id="display-sui-text" value="-4096, 1024, -4096" gray="0" boost="0"/>
<gammagroup id="selection-bg" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="current-active" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="window-text" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="button-text" value="0, 0, 0" gray="0" boost="0"/>
<gammagroup id="visualizers" value="0, 0, 0" gray="0" boost="0"/>
</gammaset>
Many thanks to Dro for pointing me in the right direction.