The following URL have some applets with lake effects:

http://thundercloud.net/activescreens/active-seascape.htm
http://javaboutique.internet.com/Lake
http://www.javascriptkit.com/java/java12.shtml

Using JRE 1.4.1-RC, it didn't work on window XP and window ME, but I tested on my window NT, it works fine. It looks like some drawing problem.

A screen capture is attached.