class Salamander_Advent_Walker extends Walker_page {
    private $color_idx = 1;
    function start_el(&$output, $item, $depth, $args) {

        $output .= '
                    <li class="color'.$this->color_idx.' active">' . apply_filters( 'the_title', $item->post_title, $item->ID );
        $this->color_idx++;
        if ($this->color_idx > 4) {
            $this->color_idx = 1;
        }
//__return_zero;
//__return_false;
    } // ends function
} // ends class