Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Download iOS 7 Wallpapers
If you are not a developer and haven’t got your hands on a developers beta of iOS 7 yet but if you want to make your iOS 6 look like iOS 7 then we have uploaded all the wallpapers from iOS 7.
The wallpapers are dynamic but for obvious reasons we could only upload the static versions.
Apple announced iOS 7 at yesterdays WWDC 2013 keynote along side the new Mac Pro and Mac OS X 10.9 Maverick.
If you find any other features which Apple forgot to tell us about be sure to let us know either on Twitter or email Tips@MacReviews.com