[Q] General theme question

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Hi guys,

I've read lot of general things about how to theme an app, because I want to theme phone.apk.
In almost every description you have to use awd-launcher or modify the layout and res xml files, that's not what I'm looking for.

My target is to create an "app" which you can install on a standard rom and this app changes the look of phone.apk. Is this possible?

Thanks, Flo