At A Glance Hook

How do you use the At A Glance widget hook? The codex doesn’t seem to have any information on how to effectively use it and the code itself seems ambiguous.

This is is wp-admin/includes/dashboard.php:

	/**
	 * Filters the array of extra elements to list in the 'At a Glance'
	 * dashboard widget.
	 *
	 * Prior to 3.8.0, the widget was named 'Right Now'. Each element
	 * is wrapped in list-item tags on output.
	 *
	 * @since 3.8.0
	 *
	 * @param array $items Array of extra 'At a Glance' widget items.
	 */
	$elements = apply_filters( 'dashboard_glance_items', array() );

	if ( $elements ) {
		echo '<li>' . implode( "</li>\n<li>", $elements ) . "</li>\n";
	}

How can you add an extra item using the filter?

I ask this because it returns a default icon because I can’t seem to change the class on the li of the link.