CJ, many of the colors are RGBA (includes an opacity) and/or have gradients and/or use graphics.
Mostly, I have played with the opacity to make the colors match backgrounds and conditional formatting. Be aware that a list view may use alternating colors.
While editing the CSS in themes is strongly discouraged, you may look at the documents to discover what colors are used in the CSS, if you cannot determine them in the Inspector.
-- sent from my iPhone4 --