Where can I locate the picture that is currently being used for my lock screen? I have a picture that I cherish deeply being used as my lock screen. The problem is that the  Micro SD card I was using became corrupted at one point and needed to be formatted so the picture was lost. I need to know if there is a location on the files of the phone where I can copy it from. I mean the picture has to be being used somewhere right? 

I was using an app called "File Manager" to search through the files and try to find it. If anyone can point me in the right location I would really appreciate it. 

Android Version: 4.0.4
From what I can tell from the other answers it sounds like the image you wish to retrieve is also your wallpaper.
If that is the case you could use an app I have been working on for this exact purpose, called Get Current Wallpaper.

It will retrieve your current wallpaper, save it to your Pictures folder on your external storage drive and allow you to share it with whatever app you use to share images :)