You can change the colors by yourself in this way:
*user data*\skins\*yourskinname*\panels
open the settings.xml file with editor and search these entries:
<colour name="low attribute" red="230" green="35" blue="30"/>
<colour name="normal attribute" red="230" green="35" blue="30"/>
<colour name="good attribute" red="250" green="195" blue="0"/>
<colour name="excellent attribute" red="7" green="191" blue="10"/>
you have to overwrite the old colour name lines!!! this example would change bad into red, good into yellow and excellent into green colour
also you can look here for the value of colors...
http://de.selfhtml.org/helferlein/farben.htm (sorry its only in german, but if you click on a cololur, you see the values)
sorry for my bad english