Board Thread:Dark Souls II/@comment-3514681-20140509211653/@comment-96.48.25.0-20141208111340

It can be farmed infinitely. Burning Bonfire Ascetics in the Far Fire Bonfire in town to kill the skeletons over and over (always drops 1 per kill) or just keep farming the chest in the first Bonfire in the Forest.

Of course, if you do Giant Lord runs, you will probably have enough regular sized Smooth and Silky stones to get enough effigies to last all NG+10. You can finally turn all those flames blue!