Try tineye.com to see if it finds the original background artist. I used in on my AVI and it found 62 copies of that image many of them changed and none credited and it only has a small database presently.
You may have to wait until after the weekend as their site is down for maintenance right now.
August 11, 2008 5:22pm DISCLOSURE: I was not able to determine the origin or author of the background image used for this composition, which is not and will not be used for any commercial purposes. If you know the origin or author of the background image or you are aware of any copyright infringement or usage restriction, please let me know and I will remove this image immediately, if needed. Thank you.