How to change morale/power bar colors?

[Silverangel]

My re-skin is looking beautiful in universal tones of gold and burgundy. However, these colors clash badly with the blue and green bars in all vitals displays. I've played with a vitals overlay TGA file, but it seemed to do nothing.

This is not as trivial (to me) as it sounds. Is there any way to change the color of the existing morale and power bars, either by reskinning or by, in a worst case scenario, a Lua plugin?

All I've been able to find is the Palantir plugin, but these Lua controls seem to be for the added vertical bars, not for the existing vitals displays. Any help, or pointing me in the right direction, would be appreciated.