I discovered this when I was testing out holy paladin with this new patch (Protadin sucks ass for now /
For this trick, you need 2 talents points on Blessed Live "You have a 100% change to gain a charge of holy power whenever you take direct damage. This effect cannot occur more than once every 2 seconds".
After you got your points on that talent, go to orgrimmar (Don't know if there is any Mighty blazes in other cities) and stand in a fire goblet , called Mighty blaze, and every time it hits you, you get Holy power.