Menu items with images (menu blocks)

export navigation view.php

$view = new view();
$view->name = 'navigation';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'node';
$view->human_name = 'Navigation';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['title'] = 'Navigation subpages';
$handler->display->display_options['use_more_always'] = FALSE;
$handler->display->display_options['use_more_text'] = 'meer';
$handler->display->display_options['access']['type'] = 'perm';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['exposed_form']['options']['submit_button'] = 'Toepassen';
$handler->display->display_options['exposed_form']['options']['reset_button_label'] = 'Opnieuw instellen';
$handler->display->display_options['exposed_form']['options']['exposed_sorts_label'] = 'Sorteren op';
$handler->display->display_options['exposed_form']['options']['sort_asc_label'] = 'Oplopend';
$handler->display->display_options['exposed_form']['options']['sort_desc_label'] = 'Aflopend';
$handler->display->display_options['pager']['type'] = 'none';
$handler->display->display_options['style_plugin'] = 'list';
$handler->display->display_options['style_options']['class'] = 'grid-2 list counter';
$handler->display->display_options['style_options']['wrapper_class'] = 'subpages';
$handler->display->display_options['row_plugin'] = 'node';
$handler->display->display_options['row_options']['view_mode'] = 'navigation_item';
$handler->display->display_options['row_options']['links'] = FALSE;
/* Veld: Inhoud: Titel */
$handler->display->display_options['fields']['title']['id'] = 'title';
$handler->display->display_options['fields']['title']['table'] = 'node';
$handler->display->display_options['fields']['title']['field'] = 'title';
$handler->display->display_options['fields']['title']['label'] = '';
$handler->display->display_options['fields']['title']['alter']['word_boundary'] = FALSE;
$handler->display->display_options['fields']['title']['alter']['ellipsis'] = FALSE;
/* Contextueel filter: Inhoud: Nid */
$handler->display->display_options['arguments']['nid']['id'] = 'nid';
$handler->display->display_options['arguments']['nid']['table'] = 'node';
$handler->display->display_options['arguments']['nid']['field'] = 'nid';
$handler->display->display_options['arguments']['nid']['default_action'] = 'default';
$handler->display->display_options['arguments']['nid']['exception']['title'] = 'Alle';
$handler->display->display_options['arguments']['nid']['default_argument_type'] = 'node';
$handler->display->display_options['arguments']['nid']['summary']['number_of_records'] = '0';
$handler->display->display_options['arguments']['nid']['summary']['format'] = 'default_summary';
$handler->display->display_options['arguments']['nid']['summary_options']['items_per_page'] = '25';
$handler->display->display_options['arguments']['nid']['specify_validation'] = TRUE;
$handler->display->display_options['arguments']['nid']['break_phrase'] = TRUE;
/* Filtercriterium: Inhoud: Gepubliceerd */
$handler->display->display_options['filters']['status']['id'] = 'status';
$handler->display->display_options['filters']['status']['table'] = 'node';
$handler->display->display_options['filters']['status']['field'] = 'status';
$handler->display->display_options['filters']['status']['value'] = 1;
$handler->display->display_options['filters']['status']['group'] = 1;
$handler->display->display_options['filters']['status']['expose']['operator'] = FALSE;
/* Filtercriterium: Inhoud: Type */
$handler->display->display_options['filters']['type']['id'] = 'type';
$handler->display->display_options['filters']['type']['table'] = 'node';
$handler->display->display_options['filters']['type']['field'] = 'type';
$handler->display->display_options['filters']['type']['value'] = array(
  'page' => 'page',
  'detailpagina_dienst' => 'detailpagina_dienst',
);

/* Display: Navigation subitems */
$handler = $view->new_display('block', 'Navigation subitems', 'navigation_subitems');
$handler->display->display_options['defaults']['hide_admin_links'] = FALSE;
$handler->display->display_options['defaults']['sorts'] = FALSE;
$handler->display->display_options['block_description'] = 'View - Navigation subitems';
$translatables['navigation'] = array(
  t('Master'),
  t('Navigation subpages'),
  t('meer'),
  t('Toepassen'),
  t('Opnieuw instellen'),
  t('Sorteren op'),
  t('Oplopend'),
  t('Aflopend'),
  t('Alle'),
  t('Navigation subitems'),
  t('View - Navigation subitems'),
);

menu items with images.php

<?php
/*
 * Menu block with images example
 * Array of node id's will be passed on to a view that outputs the html ul
 * 
 *** Drupal to do:
 * Create DS display 'Navigation item' (fields: title & image)
 * Import view
 * Add this code to your template.php of the active theme
 * 
 *** Adjust code below:
 * Customize the region too
 * Check your block's id and change the cdelta values as needed
 * Adjust the view where you pass onto the array of id's
 */

/*
 * Implements template_preprocess_block
 * Needed modules: views, menu block
 */
function the_aim_theme_preprocess_block(&$variables) {
  // add boolean to remove outer wrapper
  if (in_array('no-wrapper', $variables['classes_array'])) {
    $variables['no_wrapper'] = TRUE;
  }

  //preprocess the output of the menu block
  if($variables['elements']['#block']->module == 'menu_block' && $variables['elements']['#block']->region == 'content_under'){
    // theme subpage block - check the bid
    if( isset($variables['elements']['#config']['delta']) )  {
      
      //only for specific block id's
      if ($variables['elements']['#config']['delta'] == 3 || $variables['elements']['#config']['delta'] == 4 ) {
        
        $arrayofnodes = array();
        foreach($variables['elements']['#content'] as $key => $menuitem) {      

          if(is_numeric($key)) {
            //get node id from href menuitem
            $node = explode("/", $menuitem['#href']);
            //add to array
            $arrayofnodes[] = $node[1];
          } 
        }
        //convert array to comma separated string
        $arrayofnodes = implode(",", $arrayofnodes);
        //pass the string of node id's to the view and embed it in the block content
        $blockcontent = views_embed_view('navigation', 'navigation_subitems', $arrayofnodes); 
        $variables['content'] = $blockcontent;
      }

    }

  }
}