Great. Thanks for getting me to take a second look at that.
Here's what I've done so far.
-Loaded up Sample Skin
-Used color picker to get rbg value of the bar I'm interested in
-Looked up that value in the xml file
Found this and this was the only instance of that rbg value in the document:
<!-- 1x28, or wider to create image or pattern effects - 63,99,140 160,180,198 -->
Here I am a little stuck and puzzled what to do next. The rbg value is commented out...so how has that element been assigned that value? How would I integrate this into my current skin?