System tray icon

Please can someone give me some clues on how I can change the varying shades of grey surrounding the white curved arrow in PAM's icon in the system tray to varying shades of the red used for menu's default surround.

I would like it to stand out more amongst all the other icons in the system tray and to diffentiate it when I have two running testing a beta.

I wouldn't mind if one of you graphics experts found it was quicker to do it for me than to describe how to.

TIA, Roger