> "There's nobody doing really creative screen savers these days, that I know of." xscreensaver, which even runs on iOS and OS X, continues to release new modules:

http://www.jwz.org/xscreensaver/

For nostalgia, DarkSide of the Mac had a pretty sweet freeware screensaver collection. (http://www.poubelle.com/DarkSide.html)

Erfert Fenton's book "Art of Darkness" came with a bunch of add-on screensavers for AD. I remember the chalkboard module being particularly impressive.