Anybody can change the clock color by using apktool to decompile services.jar (you don't need to change its extension).
From there, go to com/android/server/status and edit StatusBarIcon.smali.
...in the format AARRGGBB, I believe... two hexidecimal digits for alpha, two for red, two for green, two for blue. If you don't know what digits you color is, use the color picker on a free photo editing program (like GIMP) to find out.
My example above creates white with full opacity. You don't have to invert the hex or write it backwards or anything, so don't sweat it