As you can see the default value is grayed out, and when you type something in the field it's black.
This is because the fields are provided with a specific class on the 'active' and 'blurred' state.
I know, the active state doesn't have much added value, but hey... it's there. :)
To style the field depending on it's status, just add these stylesheets to your layout:
.clearFieldBlurred { color: #666; font-style: italic; }
.clearFieldActive { color: #000; }
You probably only need the .clearFieldBlurred class, style it to your needs!
It's possible to rename those classes, do so in your javascript function:
$(document).ready(function() {
$('.clearField').clearField({
blurClass: 'myBlurredClass',
activeClass: 'myActiveClass'
});
});