Display image from media library

Embed_image.php

//Embed Images
function get_images_from_media_library() {
    $args = array(
        'post_type' => 'attachment',
        'post_mime_type' =>'image',
        'post_status' => 'inherit',
        'posts_per_page' => 5,
        'orderby' => 'rand'
    );
    $query_images = new WP_Query( $args );
    $images = array();
    foreach ( $query_images->posts as $image) {
        $images[]= $image->guid;
    }
    return $images;
}

function html5_insert_image($html, $id, $caption, $title, $align, $url) {
  $html5 = "<figure id='post-$id media-$id' class='align-$align'>";
  $html5 .= "<img src='$url' alt='$title' />";
  if ($caption) {
    $html5 .= "<figcaption>$caption</figcaption>";
  }
  $html5 .= "</figure>";
  return $html5;
}
add_filter( 'image_send_to_editor', 'html5_insert_image', 10, 9 );

To display attacment in main post, insert this code in loop

<?php
							if ( $thumbnail_id = get_post_thumbnail_id() ) {
								if ( $image_src = wp_get_attachment_image_src( $thumbnail_id, 'normal-bg' ) )
								printf( ' style="background-image: url(%s);"', $image_src[0] );
							}
							?>>