Crush one pack of Oreo cookies by adding cookies to a blender or food processor. Set aside. Crush the other pack of Oreo cookies by adding cookies to a blender or food processor. Blend to crush then add vanilla ice cream. Blend until mixed. Scoop the cookie ice cream mixture to a deep dish or plastic flower pot. Add a few gummy worms if you'd like. Add the other crushed Oreo cookies on top and pack it tight so it looks like dirt on top. Add worms on top for decoration. Freeze until ready to serve.