One of our teachers recommended the Anfi site to us, as it contains some useful customisable java applets. The links on the left are based on just two of these that I have experimented with, using my own images.

"Stars", "Shifting squares", "Apocalypse horse" and "Waves" use the hue rotation applet, which seems to work particularly well on colour gradients. Any apparent movement is an illusion caused by the colour shifts.

The "shells" image is for a possible splash screen to a site on British shells.