wptips_new_default_header_images for forest

functions.php

<?php
//ADD NEW DEFAULT HEADER IMAGES
function wptips_new_default_header_images() {
	$child2011_dir = get_bloginfo('stylesheet_directory');
	register_default_headers( array (
		'image1' => array (
			'url' => "$child2011_dir/images/banner1.jpg",
			'thumbnail_url' => "$child2011_dir/images/image1-thumb.jpg", // 230 x 66px
			'description' => __( 'Image Description', 'child2011' )
		) // the last image does not get a comma
	));
}
add_action( 'after_setup_theme', 'wptips_new_default_header_images' );