Thanks Meter 3
Join Date: Mar 2011
You need to decompile one apk to mod this i'm not really sure which one but I think it was SystemUI.apk -> /res/values/drawables.xml
Just decompile the apk edit your values, recompile and sign it.
You just need to read some tutorials so if you have time give it a try.
But if you are not experienced with theming and not motivated to learn something new, I would highly recommend you to use wanam xposed or some other xposed module.