Change Administrative theme I have changed my Administrative Theme to a theme I don't like and now I cannot change it back. There is a drop down to change, but no save configuration option anymore.
You can change it back with drush:

drush vset admin_theme seven


Or PHP:

variable_set('admin_theme', 'seven');


Or if you're in a real bind, via the settings.php file temporarily:

$conf['admin_theme'] = 'seven';


Replace "seven" with the machine name of the theme you want to use for the admin pages.