Thank you all.
I will likely do a reinstall, as I am using Rawhide, and would like to test the lastest good iso.
Here is what I think I did, and my mistake was doing it at 3 in the morning, when I was half asleep.
I logged in as root, so that I could rename the file:
/usr/share/images/backgrounds/default.png
At some point, I got an error message that said I did not have permission.
I can started clicking on things and eventually succeeded in renaming the file ( default background image for log-in screen )
When I logged back in as "me", sudo no longer worked.
But I now have an awesome backsplash. LOL!
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