As appealing as Sam Worthington is as Greek hero Perseus, there are far more eye-catching creatures in “Wrath of the Titans.” The mythical monsters in the movie opening Friday are as gory and scary as the Aussie actor is sexy. And it was no easy task creating them. “The design process probably started even six months before we started shooting,” says director Jonathan Liebesman . “In mythical lore, creatures were described in a certain way. And a lot of us have interpreted them with certain bells and whistles. And we wanted to take them back to basics. “Storytellers, like Homer, describe them a certain way,” he adds. “So we just wanted to take the tactic of, ‘What did these things really look like?’” Among the monsters is the Minotaur, who in Greek mythology is said to be a creature with the head of a bull on the body of a man. In the film, the Minotaur’s face is not quite all beast. “It was a warrior who had been stuck down in a labyrinth for so long that his hair, kind of like a rh...