Do Macbooks still come with accelerometers?
I recall my old Macbook having one and being able to use certain apps for it such as an Alarm that worked just like a car alarm (using the bundled remote) if someone were to move the Macbook while you were away.
Thinking back to this, I thought it'd be awesome if OSX had Parallax wallpaper just like iOS 7 does. It wouldn't be as pronounced since your screen will be mostly static, but for those of us who tend to use them on our laps while on the couch or in bed, I think it'd be pretty cool. The effect would also work when opening and closing the display.
Dunno. Just a thought. I just don't know if Apple stopped the whole accelerometer thing or not.