I don’t remember who exactly gave me this script. Must be either Verma or Manas, but this one is so cool.
The code looks pretty easy and clear, though I didn’t try to understand it completely.
So this is what you have to do.

Open Google image search and search for some image. If you are lazy to do that, click
http://images.google.com/images?hl=en&q=sp2hari&btnG=Search+Images&gbv=2

Then copy this javascript code and paste it in the URL bar
javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI= document.images; DIL=DI.length; function A(){for(i=0; i<DIL; i++){DIS=DI[ i ].style; DIS.position='absolute'; DIS.left=Math.sin(R*x1+i*x2+x3)*x4+x5; DIS.top=Math.cos(R*y1+i*y2+y3)*y4+y5}R++}setInterval('A()',5); void(0)

Cool right? ;-)