code: def changeThreadColor(self, color, thread_id=None):
          
          thread_id, thread_type = self._getThread(thread_id, None)
  
          data = {
              "color_choice": color.value if color != ThreadColor.MESSENGER_BLUE else "",
              "thread_or_other_fbid": thread_id,
          }
          j = self._post(self.req_url.THREAD_COLOR, data, fix_request=True, as_json=True)
docs: Changes thread color
  
          :param color: New thread color
          :param thread_id: User/Group ID to change color of. See :ref:`intro_threads`
          :type color: models.ThreadColor
          :raises: FBchatException if request failed