I was just going to say that, the way apps like Passbook, Reminders, and even the App Switcher show your background already make your wallpaper feel like a theme in itself.Color themes for different colored iphone ? Oh please no.
Thats just not the way apple works I think.
Maybe you know this, but in iOS 7 the whole look will change based on the wallpaper because the transparent gaussian blur effect that overlays the phone UI, and that is a very elegant way imo.
And this is as good as it gets in terms of customisation on stock iOS.
Changing the wallpaper has no effect on apps -- the UI in Safari, Notes, Reminders, etc, are all bright colored lines / fonts on white background. As people have been pointing out in various threads, this makes it difficult to distinguish UI from app content. IMO, that is what should be changed.Seriously, it's probably like that for design reasons. As others have said, you can alter the look with your wallpaper.
I'm thinking no. No color themes, no colored phones.