New website iPhone Theme Generator does exactly what its name tells you: it allows you to create your own iPhone theme, in just a few clicks. Simply choose your wallpaper, dock and status bar from a library or upload your own. You also have the ability to choose your own icons.
Once you’re done, click “Compile Theme” and it will generate a download link. Download the zip file, unzip it and install the theme through SSH or using iPhoneBrowser.
I think this website has great potential, expecially for theme freaks like me that love to create their own.