I have accidentally changed my user ID picture on my Macbook Pro (running OS X 10.7.5). The original user ID snapshot is very dear to me and I can't find the original file saved anywhere. Is there a way to reset/recover the original User ID snapshot? I have tried to find it under Library/ User Pictures/ but only the pre-installed icons seem to be showing here. Any help would be much appreciated.
Execute this command in Terminal and see what happens:
dscl . -read /Users/[user_shortname] JPEGPhoto | tail -1 | xxd -r -p > ~/Desktop/any_file_name.jpg
dscl . -read /Users/U92 JPEGPhoto | tail -1 | xxd -r -p > ~/Desktop/U92.jpg
Gleaned and distilled from this AskDifferent page.