Using the application Nova Launcher, some guy with user name “shmogt” created icons and interface identical to iOS 7. At this point, Jelly Bean theme is optimized for Samsung Galaxy S3, but can also be used on other phones.
Besides the usual change of the background and icons theme jbOS7 offers new lockscreen, as well as two additional homescreens serving as applications. For example, one homescreen is devoted entirely to weather application, as you can see on the image.
You can download this theme from dropbox