I tried that one out about two years ago. Just be aware incase you have kids, it grabs random images off the net. Therefore, within a few minutes you will have smut pics on your desktop, eventually hardcore. I would not recommend this screen saver to anybody.
One I would recommend if you are interested is "Euphoria" found under "open gl" screensavers.
I realize that is not much help, but I thought maybe you were not aware of the issues with webcollage.