Any official way to create an admin theme?

I was wondering whether there’s a common way of customising the aspect of the admin panel.
I know you can play with the css and js files but what I was looking for is some kind of “admin theme” like with drupal.

I´m asking so that you can personalize the admin panel while keeping your WP easily updateable.

Thanks in advance.

There is currently no way to create admin themes like Drupal.
Here are some tips which cover most of the basic admin panel customization needs: http://www.cmurrayconsulting.com/wordpress-tips/customizing-wordpress-admin/