Patch for the Drupal Image javascript crop module (version 7.x-1.0-rc3) that forces the module to use the admin theme rather than the normal one (see https://drupal.org/node/1491494).

imagecrop_theme.patch

diff --git a/imagecrop.module b/imagecrop.module
index f3e2f72..40bf3f1 100644
--- a/imagecrop.module
+++ b/imagecrop.module
@@ -31,6 +31,10 @@ function imagecrop_permission() {
   );
 }
 
+function imagecrop_get_theme() {
+  return variable_get('admin_theme');
+}
+
 /**
  * Implements hook_theme().
  */
@@ -104,6 +108,7 @@ function imagecrop_menu() {
     'page arguments' => array(2, 3),
     'type' => MENU_CALLBACK,
     'access callback' => 'imagecrop_has_access',
+    'theme callback' => 'imagecrop_get_theme',
     'file' => 'includes/imagecrop.admin.inc',
     'title' => 'Imagecrop overview',
   );
@@ -113,6 +118,7 @@ function imagecrop_menu() {
     'page arguments' => array(2, 3, 4),
     'type' => MENU_CALLBACK,
     'access callback' => 'imagecrop_has_access',
+    'theme callback' => 'imagecrop_get_theme',
     'file' => 'includes/imagecrop.admin.inc',
   );
 
diff --git a/includes/imagecrop.theme.inc b/includes/imagecrop.theme.inc
index c318ab0..c9749a0 100644
--- a/includes/imagecrop.theme.inc
+++ b/includes/imagecrop.theme.inc
@@ -17,7 +17,7 @@ function imagecrop_page($variables) {
     $output .= $variables['messages'];
   }
 
-  global $theme;
+  $theme = imagecrop_get_theme();
   $query = db_select('block');
   $query->addField('block', 'region');
   $query->condition('theme', $theme);
@@ -25,7 +25,6 @@ function imagecrop_page($variables) {
   $query->condition('delta', 'main');
   $region = $query->execute()->fetchField();
 
-  global $theme;
 
   if (isset($variables['page'][$region])) {
     $output .= drupal_render($variables['page'][$region]);