Seriously? I've had Mac's since 2002 and every version of OS X since then, multiple iPods, an iPhone and have seen a lot of iPads. But I really can remember seeing a black and white interface on any of them. When thing's are gray on an Apple product there always either a metal effect or some sort of gradient, not solid black. Apple's newest icons are also all square with rounded corners.
Take a look at the menu bar of one of your many "Mac's" and note the wide array of b&w icons surrounding the clock. Even the Apple men has been monochrome (has a gradient, but subtle) for years.
There are also other places where Apple has used monochrome icons, such as at startup, the monochrome Apple logo, gear, and Option-boot icons for drives. Seems like with all your "Mac's" you haven't been very observant. You could also look at the early iPods, none of which were grey because they had B&W screens!
The Zune wasn't ahead of this curve any more than Vista was--both were at least 6 years behind Mac OS X in 2001, but thanks for offering your Apocryphal Computer History to refute what everyone else sees as the simple truth.