Хорошо подойдет для клан-сайтов CS. На скрине видно плохо, поэтому ставим и смотрим.
В head, на нужную страницу ставим это:

<SCRIPT language=JavaScript>
<!--
Image0 = new Image();
Image0.src = "http://s60.radikal.ru/i168/0812/14/ad6a2d559114.gif";
Amount = 10;
Ymouse = -50;
Xmouse = -50;
Ypos = new Array();
Xpos = new Array();
Speed = new Array();
rate = new Array();
grow = new Array();
Step = new Array();
Cstep = new Array();
nsSize = new Array();
ns = (document.layers)?1:0;
(document.layers)?window.captureEvents(Event.MOUSEMOVE):0;
function Mouse(evnt) {
Ymouse=(document.layers)?evnt.pageY-20:event.y-20;
Xmouse=(document.layers)?evnt.pageX:event.x;
}
(document.layers)?window.onMouseMove=Mouse:document.onmousemove=Mouse;
for (i = 0; i < Amount; i++) {
Ypos[i] = Ymouse;
Xpos[i] = Xmouse;
Speed[i] = Math.random()*4+1;
Cstep[i] = 0;//osw
Step[i] = Math.random()*0.1+0.05;
grow[i] = 5;
nsSize[i] = Math.random()*15+5;
rate[i] = Math.random()*0.5+0.1;
}
if (ns) {
for (i = 0; i < Amount; i++) {
document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0><img src="+Image0.src+" name='N' width="+nsSize[i]+" height="+nsSize[i]+"></LAYER>");
}
}
else {
document.write('<div style="position:absolute;top:0px;left:0px"><div style="position:relative">');
for (i = 0; i < Amount; i++) {
document.write('<img id="si" src="'+Image0.src+'" style="position:absolute;top:0px;left:0px;filter:alpha(opacity=80)">');
}
document.write('</div></div>');
}
function Fly() {
var hscrll = (document.layers)?window.pageYOffset:document.body.scrollTop;
var wscrll = (document.layers)?window.pageXOffset:document.body.scrollLeft;//fantasyflash.ru
for (i = 0; i < Amount; i++){
sy = Speed[i] * Math.sin(270 * Math.PI / 180);
sx = Speed[i] * Math.cos(Cstep[i] * 4);
Ypos[i] += sy;
Xpos[i] += sx;
if (Ypos[i] < -40) {
Ypos[i] = Ymouse;
Xpos[i] = Xmouse;
Speed[i] = Math.random() * 6 + 4;
grow[i] = 5;//osw
nsSize[i] = Math.random() * 15 + 5;
}
if (ns) {
document.layers['sn'+i].left = Xpos[i] + wscrll;
document.layers['sn'+i].top = Ypos[i] + hscrll;
}
else {
si[i].style.pixelLeft = Xpos[i] + wscrll;
si[i].style.pixelTop = Ypos[i] + hscrll;
si[i].style.width = grow[i];
si[i].style.height = grow[i];
}
grow[i] += rate[i];
Cstep[i] += Step[i];
if (grow[i] > 15) grow[i] = 15;
}
setTimeout('Fly()', 10);
}
Fly();
-->
</SCRIPT>