Even my friend had that problem, usually screens go like that when a lot of pressure (physical) is applied on them. Either she sat on it, or the fall was just an excuse :P.
Here! Not the sense apk but the touchwiz zip. This is the s3 version which you'll have to install (the zip) via cwm https://docs.google.com/file/d/0B6lzyKaqzYBCMk1mMno0UGF1a0U/edit?usp=docslist_api