Class is not the same as boring and the iPhone doesn’t use flashy colors anywhere (except where flashy colors are appropriate: to help distinguish between different apps, for the low battery warning, the reminder badge, the slider to turn it off, you get the idea). Nobody in their right mind would call the iPhone’s UI boring. Never mind the subdued dull blue and grey.

OS X was candy colored. A decade ago. The iPhone lost the candy, Mac OS X has some vestigial buttons and scrollbars but is otherwise very much moving towards battleship grey. But its past, present and future aren’t exactly boring.