I don't know if this is a new setting or not, but I just stumbled across it. In Settings >>> General >>> Accessibilty All the way at the bottom you can customize a triple click shortcut. One of them being a white/black toggle that reverses the color scheme on the phone. Seems pretty un-Apple like. The look it produces makes it look like it was jailbroken! Sorry if this is old news, it's just something I thought I'd share.