Theming without flashing?

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http://androidforums.com – Is it possible to take the picture files from the framework's drawable hdpi from another rom or theme and "inject" them into my framework and push it to my phone basically theming it? I'm not planning on making a theme or ROM to release if you guys are wondering "This guy's gonna take a bunch of stuff from everyone's work and release it as his own" haha (General)