Griffiths' Internet Classic...
The Snow Applet - click for download page
David Griffiths' Snow Applet
is growing to be a perennial favorite in the winter months. This
extremely easy to use applet is well-behaved, and a snap to set up (even
for complete novices).
David's applet is free. The kit he
provides is superb -- this demo is taken directly from it -- so do take time to read it