Background Finder image in 'all files' folder

Before my upgrade to lion, I had some cool shelves on my background of Finder. I decided after my switch to lion, to scrap them. I was able to delete them from every folder, except now it is permanently stuck in my 'All Files' Folder. I cannot change it back to white. I have read some places that other people can't change it from white to something else. How can I remove this image?

There must be somewhere on the computer where there is a copy of the picture for Finder to be using. If anyone knows where it is, that would be great. My guess is in the system folder somewhere.

Thanks,

Andy