private BookmarkNode addImagesRecursive(BookmarkNode node) {
    node.setFavicon(mGenerator.nextBoolean() ? getRandomImageBlob() : null);
    node.setThumbnail(mGenerator.nextBoolean() ? getRandomImageBlob() : null);

    for (BookmarkNode child : node.children()) {
      addImagesRecursive(child);
    }

    return node;
  }