I hardly think using an image as a desktop is a copyright violation.
I tried quickly searching for it but didn't get any high resolution images, sorry.
Then you should think again, or consult a legal professional in your jurisdiction, because my reading of the US copyright law has me believing that offering a third party's image for monetary gain without the copyright holder's permission is illegal. My reading also has me believe that if it's an image from a book that's registered with the US Copyright office putative damages apply which puts the potential liability in the five to six figure range.
I do a fair amount of computer forensics, often dealing with intellectual property issues.
You'll find that most photography forums that include people selling images for money will have people who're more familiar with the copyright issues than the average person, and who understand what it means to have their images abused by folks who don't have permission.
YMMV, IANAL, HTH- HAND...