Это скрипт для падения снежинок на любой ,по вашему усмортению, страници сайта. 
 Скрипт можно изменять и падать может что угодно =]  
Code
<SCRIPT LANGUAGE="JavaScript1.2"> 
 <!-- Begin 
 var no = 35; // количество снежинок 
 var speed = 6; // скорость снежинок 
 var snowflake = "ССЫЛКА_НА_СНЕЖИНКУ"; 
 var ns4up = (document.layers) ? 1 : 0; 
 var ie4up = (document.all) ? 1 : 0; 
 var dx, xp, yp; 
 var am, stx, sty; 
 var i, doc_width = 800, doc_height = 600; 
 if (ns4up) { 
 doc_width = self.innerWidth; 
 doc_height = self.innerHeight; 
 } else if (ie4up) { 
 doc_width = document.body.clientWidth; 
 doc_height = document.body.clientHeight; 
 } 
 dx = new Array(); 
 xp = new Array(); 
 yp = new Array(); 
 am = new Array(); 
 stx = new Array(); 
 sty = new Array(); 
 for (i = 0; i < no; ++ i) { 
 dx[i] = 0; 
 xp[i] = Math.random()*(doc_width-50); 
 yp[i] = Math.random()*doc_height; 
 am[i] = Math.random()*20; 
 stx[i] = 0.02 + Math.random()/10; 
 sty[i] = 0.7 + Math.random(); 
 if (ns4up) { 
 if (i == 0) { 
 document.write("<layer name=\"dot"+ i +"\" left=\"15\" "); 
 document.write("top=\"15\" visibility=\"show\"><img src=\""); 
 document.write(snowflake + "\" border=\"0\"></layer>"); 
 } else { 
 document.write("<layer name=\"dot"+ i +"\" left=\"15\" "); 
 document.write("top=\"15\" visibility=\"show\"><img src=\""); 
 document.write(snowflake + "\" border=\"0\"></layer>"); 
 } 
 } else if (ie4up) { 
 if (i == 0) { 
 document.write("<div id=\"dot"+ i +"\" style=\"POSITION: "); 
 document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: "); 
 document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\""); 
 document.write(snowflake + "\" border=\"0\"></div>"); 
 } else { 
 document.write("<div id=\"dot"+ i +"\" style=\"POSITION: "); 
 document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: "); 
 document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\""); 
 document.write(snowflake + "\" border=\"0\"></div>"); 
 } 
 } 
 } 
 function snowNS() { 
 for (i = 0; i < no; ++ i) { 
 yp[i] += sty[i]; 
 if (yp[i] > doc_height-50) { 
 xp[i] = Math.random()*(doc_width-am[i]-30); 
 yp[i] = 0; 
 stx[i] = 0.02 + Math.random()/10; 
 sty[i] = 0.7 + Math.random(); 
 doc_width = self.innerWidth; 
 doc_height = self.innerHeight; 
 } 
 dx[i] += stx[i]; 
 document.layers["dot"+i].top = yp[i]; 
 document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]); 
 } 
 setTimeout("snowNS()", speed); 
 } 
 function snowIE() { 
 for (i = 0; i < no; ++ i) { 
 yp[i] += sty[i]; 
 if (yp[i] > doc_height-50) { 
 xp[i] = Math.random()*(doc_width-am[i]-30); 
 yp[i] = 0; 
 stx[i] = 0.02 + Math.random()/10; 
 sty[i] = 0.7 + Math.random(); 
 doc_width = document.body.clientWidth; 
 doc_height = document.body.clientHeight; 
 } 
 dx[i] += stx[i]; 
 document.all["dot"+i].style.pixelTop = yp[i]; 
 document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]); 
 } 
 setTimeout("snowIE()", speed); 
 } 
 if (ns4up) { 
 snowNS(); 
 } else if (ie4up) { 
 snowIE(); 
 } 
 // End --> 
 </script>