I've managed to build on tomiannelli's original Perfstack re-skin, but this time I've succeeded in hunting down where the style sheets for the new Perfstack widgets live! Simply drop the contents of the attached .zip into whichever drive holds your inetpub folder. You will need to clear cache/cookies/etc in your browser for the changes to appear.
These colors are branded to my company and they are far from perfect, feel free to make your own changes! Tom's article does a great job explaining the different color codes and how to adjust them yourself. Please note that they are not designed with our color deficient friends in mind, so sorry about that! I was going purely for brand accuracy here.
IMPORTANT: MAKE A BACKUP OF THE ORIGINAL .CSS FILES BEFORE YOU REPLACE THEM