AlphaSave - Programmable screen saver. You can add your own savers to the package. - http://www.alpha-programming.co.uk/software/package.php?os=riscos&package=alphasave
Bruce's Screensavers - Here you can find 7 BASIC screensavers. - http://www.goatly.pwp.blueyonder.co.uk/acorn/index.html
SmallSave - Simple screensaver from Andrew Berry. - http://www.aberry.demon.co.uk/programs/#small
Guy Griffin - Icons for popular things. - http://home.freeuk.net/guy.griffin/