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Actually, the correct way to do this without hacking the fivestar module is this... Create a helper module and in the same folder, add a folder called "widgets" and in *that* folder, put your "aces" folder... then add this to mymodule.module:

function mymodule_fivestar_widgets(){

  $widgets_directory = drupal_get_path('module', 'mymodule') .'/widgets';

  $files = file_scan_directory($widgets_directory, '\.css$');

  $widgets = array();

  foreach ($files as $file) {

    if (strpos($file->filename, '-rtl.css') === FALSE) {

      $widgets[$file->filename] = drupal_ucfirst($file->name);

    }

  }

  return $widgets;

}

Voila!