def METHOD_NAME(self, template_names):
    """Prepend the the list of template names with the path of the current theme."""
    theme_template_path = self.request.site.siteconfiguration.theme_name
    themed_template_names = [
        "{theme_path}/{template_name}".format(
            theme_path=theme_template_path, template_name=template_name.strip("/")
        )
        for template_name in template_names
    ]
    template_names = themed_template_names + template_names
    return template_names