This one is short but sweet. Usually drupal forms don't have cancel buttons that bring you back to previous page, so lets add one.
if ($form_id == 'user_profile_form'){
$form['actions']['cancel'] = array(
'#markup' => l(t('Cancel'), 'user'),
'#weight' => '666',
);
}
This will appear on user edit form and bring you back to user page when clicked.