Depends on the icons you want to change.
The signal bars are in system\framework\lge-res.apk and are of a special format, you can find how online.
The rest are in framework-res.apk, UOT is the easist way to change these or use a statusbar pre-done (check Harmonia).
Text colors are in services.jar
Beware, that if you change the color format and you will break the signing. Not a huge issue unless you are making a rom to distribute then it creates hell.