Changing fg for this element changes the NON-highlight text color of the command buttons.
<element id="Controls.Button.Highlight" bg="143,189,39" fg="255,255,255" />
And another request, maybe for later: could the search icon also be a different color when the search box is active, like the text? Picking a color that works for both is hard if they're very different.
[Edit]: Does MainPanelTopBorder still do anything? And I can't get this to appear:
<element id="TabsBar.TabInCaptionBarBlended.Separator" bg="xxx,xxx,xxx" />