How to updated OS X theme so it looks like iOS 7 design I saw few people have fancy OS X design that resemble iOS 7 design. I did not find any official information about it on Apple site about Mavericks. Though this theme appears at new Xcode page. I updated OS X but I did not get this design .. and I did not find a way to apply this design via Systems Preferences.

So how would I change my Maverics design?
This is OS X Yosemite, the next version of OS X.