Help Theming Verizon Messages App

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Hey guys. I would like to theme the Verizon Messages app that you can download from the playstore. I have the apk on my computer and used 7zip to unzip it. I have no idea where to start to get it themed. I would like to them it like the dark aosp 4.2 messaging app. I know my way around gimp fairly well just need some direction as to where the png files are and what all I might have to do. Thanks.

Ok. I think I found the png's. Looks like quite a lot to theme, but I am going to start pecking away at it.