I know your question was answered, but I am adding this just for fun:
There are so many backgrounds you could try out:
# yum list *backgrounds\*
You could also, go to any FTP site in Windows, for example:
http://mirrors.kernel.org/fedora/rel...6/os/Packages/
Download a background RPM file, and open it in Windows using 7-Zip (best open source zip app for Windows). The only thing about Windows is that it may not support PNG files correctly?