sexys, градиенты сам сделай...
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title></title>
<style>
div {
width: 100px;
height: 100px;
border-radius: 50%;
float: left;
margin-right: 50px;
}
</style>
</head>
<body>
<div></div>
<div></div>
<script>
var colors = ['red', 'green', 'blue', 'yellow', 'orange', 'purple', 'dodgerblue', 'lime'];
setInterval(function() {
document.body.children[0].style.background = colors[Math.random() * colors.length ^ 0];
document.body.children[1].style.background = colors[Math.random() * colors.length ^ 0];
}, 1000);
</script>
</body>
</html>