@peterson: Hah! Good point
.
If there's only one file in the screensavers folder, it's guaranteed to be the one, just renamed.
But that would imply duplicating the clearing of the screensavers folder (that shuffles does) from your end, before running shuffles... (ie. clear screensavers folder, copy updated image, run shuffles). Which I guess loses some of the interest of relying on shuffless vs. simply doing everything on your end... ;D