Grey is a 'different' screensaver that is not colourful but will make things happen all over your screen. Sound can be turned on/off.

FX Saver helps you to create your own professional screen saver using your favorite images and background sounds easily. Incorporated with a simple and intuitive control panel interface, you can add your favorite images, customize the appearance,...

No, nothing to do with Muppets :-) Still, one of the funniest savers around! If I would say anithing, I would spoil the fun :-)