Remember the Elune event where everyone made clusters to block the AH? Well, guess what. Spirit Candles are solid! The bad news is they do have a 5 minutes cooldown and will last for the same amount, but if you could bring along half your guild I am pretty sure you can block the AH/capital bank or whatever you feel like. Exploit this while you still can.
Proof of it being solid: http://i41.tinypic.com/1zz50mq.jpg