Menu callback; Listing of all current image styles.
function image_style_list() {
$page = array();
$styles = entity_load_multiple('image_style');
$page['image_style_list'] = array(
'#markup' => theme('image_style_list', array(
'styles' => $styles,
)),
'#attached' => array(
'css' => array(
drupal_get_path('module', 'image') . '/css/image.admin.css' => array(),
),
),
);
return $page;
}