dpts,
<a id="link" href="#">Bla-bla</a>
<script>
var colors = ['rgba(204, 204, 255, 1)', 'rgba(255, 204, 255, 1)', 'rgba(204, 153, 255, 1)', 'rgba(102, 51, 255, 1)', 'rgba(204, 51, 255, 1)', 'rgba(255, 255, 255, 1)'];
link.style.color = colors[Math.random() * colors.length ^ 0];
</script>