Issue #1106160 by tim.plunkett, BarisW: Fixed Color module uses the public file system but doesn't check if it is set.

core/modules/color/color.module

@@ -336,7 +336,7 @@ function color_scheme_form_submit($form, &$form_state) {
 
   // Prepare target locations for generated files.
   $id = $theme . '-' . substr(hash('sha256', serialize($palette) . microtime()), 0, 8);
-  $paths['color'] = 'public://color';
+  $paths['color'] = file_default_scheme() . '://color';
   $paths['target'] = $paths['color'] . '/' . $id;
   foreach ($paths as $path) {
     file_prepare_directory($path, FILE_CREATE_DIRECTORY);