The way I got it to blend with my existing wordpress template was to delete the following from the widget.php file.
$before_title = “\n” . ‘<div class=”hslice” id=”ngg-webslice” >’ . “\n”;
$before_title .= ‘<class=”widgettitle entry-title”>’;
$after_title = ”;
$after_widget = ‘</div>’.”\n” . $after_widget;