Gold toner as others have stated is your best bet. Not cheap though. Another alternative would be to use a dilute blue toner and a short bath.

The coldest tone I ever got from a paper straight out of the developer was Forte VC with one of the odd versions of Neutol, I think it was Plus. So cold my prints had icicles! They looked like they were gold toned. Sadly, neither the paper nor the developer are available any more.

The other thing to mention is to make sure you are looking at your prints under an appropriate light. If you are using incandescent, they may look a little warm even if they are cold.