Correct me if I'm wrong, but if all Panaoz is trying to do is set the background color to one particular jpg within the Book Lovers Dark Walls SharedArtwork folder, why can't all but the desired jpg be deleted from the folder? That way there's nothing to rotate.
Since I use the dark frames, they weren't visible with the dark backgrounds supplied. So I just deleted the backgrounds I didn't want. Taking that a step further, I changed the rotationPeriod from the default 300 (5 minutes) to EndOfTrack so a new background appears each time a new track starts.
I haven't experimented with this, but I would think that if there's only one background jpg in the folder, it won't (can't) rotate and therefore would remain the same.