MySpace Cursor Trail. Used originally to trail a balloon looking cursor with 3 different sized bubble images.

cursorTrail.js

function randomFromInterval(from,to)
{
    return Math.floor(Math.random()*(to-from+1)+from);
}

function cursorTrail(e){
    var i = randomFromInterval(1, 3),
        fadeOutTime = randomFromInterval(100, 200),
        top = e.pageY - randomFromInterval(15, 20),
        left = e.pageX- randomFromInterval(15, 20),
        animateTop = randomFromInterval(5, 10),
        animateLeft = randomFromInterval(5, 10);

    $mouseTrail = $('<img src="assets/images/mousetrail-' + i + '.png">')
    $mouseTrail.css({ 
        'position':'absolute',
        'opactiy':'0.5', 
        'top':top, 
        'left':left
    })
    .prependTo($('body'))
    .animate({
        left: "-="+animateLeft+"px",
        top: "-="+animateTop+"px",
        opacity: "-=0.5",
    }, fadeOutTime, function(){ 
        $(this).remove(); 
    }); 
}
$('body').mousemove( function(e){
    if(!$(e.target).is('a')){
        cursorTrail(e);
    }
});