Add Post Meta to Change Background Image
<?php
$qry_args = array(
'post_status' => 'publish', // optional
'post_type' => 'portfolio_page', // Change to match your post_type
'posts_per_page' => -1, // ALL posts
);
$all_posts_query = new WP_Query( $qry_args );
$all_posts = $all_posts_query->posts;
foreach($all_posts as $post) {
$id = $post->ID;
add_post_meta( $id, 'qode_title-image', 'http://fcc2.areavoices.com/files/2013/10/BRANDSHEADER2.jpg', true ) or update_post_meta( $id, 'qode_title-image', 'http://fcc2.areavoices.com/files/2013/10/BRANDSHEADER2.jpg', true );
$meta = get_post_meta( $id,'qode_title-image' );
echo $id . ": " . $meta[0] . '<br>';
}