List box coloring is a nasty bit of nested styles and I think even a template file. 95% sure the colors you're attempting to change are coming from image art. You'll need to either change the DDS or change the references to point at some other image.
A little tip for yah... double-clicking a style ref in UIBuilder jumps you to that style def. Handy way to drill down this maze of nested styles till you get at the base object.
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