Rooted, yes. Its just called "File Manager". I AM, just so you know, running the Eclipse ROM. Not sure if that makes a difference. Im an old iPhone modder, so I can get around. Im just ASSUMING these themes have .png files similar to the iPhone that I can tweak in PS and re-upload to the Droid??
I know there is but I would not be the best person to ask. I would think anytime you modify one of these apks you would need to sign them so they are able to be installed again but I have not messed with anything like this.