I looked through all of the extra screensavers on mandrake install disks, and i didnt run across what you are describing. Maybe browse the redhat disk, as .rpm files from redhat, to the best of my knowlege, will work on mandrake. Also check out rpm search sites, such as
http://rpm.pbone.net/ for different screensavers.
If i run across it in the next day or so, i will let ya know though.