Drupal 7 - Cambiar tema de drupal desde mysql

UPDATE system SET status=1 WHERE name = 'garland';

UPDATE variable SET value='s:7:"garland"' WHERE name = 'theme_default';

TRUNCATE cache;

UPDATE users SET theme='garland' WHERE uid = '1';

Otros casos:

Descomentar en settings.php

# $conf['theme_default'] = 'garland';