Mixing and Matching themes

Quick question about mixing and matching some images from different themes, think I have it down and just wanted to know if this would work. Basically, I'm guessing that I could just move .png files from one to the other, then push the framework-res back to the phone. Question is, whats the best way to move the .png's from one framework-res to the other? I'm opening the themes with 7zip.

My goal here is basically to change the shade in the Luna theme, and then maybe a few other things if I can get this to work, any help or tips to help me learn this stuff would be great, thanks.

7zip is just fine.