The basic idea is that faces are generated using a list of ten parameters, listed below:
These are internal parameters, not applet params, so if you want to interactively tweak the settings and see what happens, try the Interactive Mode page. Hint: click on the face area to pause the applet.
In addition, there are several parameters you can tweak in the <param> tags inside your HTML code.
The samples I give you are as follows:
Feel free to tinker with the settings on your own - especially the size and speed.