Welcome to DC, Island Dog!
I hesitated to ask this question at WinCustomize because that'd be ONE MORE FORUM I have to keep track of, so I decided against it unless my good friends here couldn't help me.
Anyways... Yes, in all my Googling I saw a suggestion to check out the 'readme' in the backgrounds folder, but when I looked, there was none to be found, just a "Backgrounds Credit.txt".
Perhaps it only comes bundled with OD+?
In any case, if you would be so kind as to shoot over a copy of that file, I'd be most appreciative, and if there are any options not covered in the readme, please let me know.
I promise if I come up with something worth sharing, I'll sign up and show everybody, agreed?