Two things
1 - according to customer support (yeah, not the most reliable of sources), Stone to Flesh makes bones in addition. The example we asked about was a statue (that was NOT a petrified person, but an actual statue), stone to flesh, then animate dead. The response was positive, that this would create a zombie, or even a skeleton if the animator wanted, with the flesh falling off the bones of the corpse created by the stone to flesh. I tend to disagree, mind you.
2 - In one of our campaigns, the bad-guy cast a modified version of stone to flesh on the inner sanctum of the lawful good clergy's temple. This version gave the flesh hundreds of human-sized mouths... the temple was crying for food when it was discovered. Well, our party hunted down the bad-guy, offed the poor jerk, and took his spell book. Everyone forgot the special feature of his stone to flesh until nearly a real-world year later... when the paladin was petrified by a medusa.
Poor bastard never takes off his armour anymore... people just tend to assume you are an evil monster when your entire body is covered in hungry mouths.