I looked at the White House which has historical info on the Oval Office. It says that Clinton, Nixon and George W. Bush all had gold curtains.
Sorry...that should say White House Museum website.
You inspired me to go ahead and see what I could find. It appears that the drapes are from Clinton, the rug is from Reagan and the couches from Bush.
http://www.whitehousemuseum.org/west-wing/oval-office-history.htm