ES: Eternal Sabbath, Elfen Lied Recommendations
Both manga are about experiments which create dangerous "people" with supernatural powers, AKA science gone mad. Both are pretty bloody, but Elfen Lied has way more gore and ecchi.
Elfen Lied and Eternal Sabbath are both about escaped lab rats. Except for the fact that these lab rats are human beings, who have mutations. They have a supernatural powers, and some are gone totally crazy, and some don't. The main difference? Elfen Lied isn't as mature as Eternal Sabbath.