Multiple sidebar styles

I have a sidebar that uses 4 widgets. Usually all widgets in a sidebar would use the same box/div style and the same heading style by adding code to the before_widget/after_widget function like below…

<?php
if ( function_exists('register_sidebar') ) {
   register_sidebar(array(
       'before_title' => '<div class="title-text" id="title-media-player">',
       'after_title' => '</div>',
       'before_widget' => '<div id="content-box">',
       'after_widget' => '</div>',

   ));
}
?>

In this site, however, I want to give each box a different colored background and a different heading style/color.

Box 1 – blue background.
Box 2 – red background.
Box 3 – green background.
Box 4 – orange backgroud.

How would I go about achieving this and getting each box/widget to display differently in the same sidebar?

Any help appreciated.