didfree,
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script src="http://code.jquery.com/color/jquery.color-2.1.1.min.js"></script>
</head>
<body>
<script>
function go()
{
var t=Math.ceil(Math.random()*16777214)
jQuery("body").animate({
backgroundColor: "#"+t.toString(16)
}, 1500, go );
}
go()
</script>
</body>
</html>