Last May I set an image I found online as my computer's desktop image, but I neglected to save this image to my computer -- just right-clicked it off the website it came from and selected the "Make Desktop Image" option. Just a few hours ago, my boyfriend accidentally changed my desktop image and despite googling for the lost image since then, I can't find it anywhere.

Is there anyway to retrieve desktop images, even if they were not saved to the hard drive? If you know, please post.

Thanks!

P.S. I have a MacBook Air, if that makes a difference.