Ephemera is a Windows screen saver that draws random IFS fractals.
Ephemera [Windows]
Freeware, Version 1.2
Ephemera is a screen saver that draws random IFS fractals, giving an ever-changing display of complex shapes reminiscent of those found in nature. Ephemera allows a wide range of configuration, so it is possible to adjust the images produced to suit your own taste. A help file is included that explains what an IFS is and how to draw your own.
http://www.muryan.com/ephemera/ephemera.html