A number of useful hooks to strip and clean up WordPress admin area.

admin-cleanup.php

<?php

/*
Plugin Name: WP Admin Snippets
Plugin URI: http://wptailor.com/
Description: A number of useful hooks to strip and clean up WordPress admin area.
Version: 0.0.1
Author: WPTailor
Author URI: http://wptailor.com/
License: GPLv3
License URI: http://www.gnu.org/licenses/gpl-3.0.html
*/

defined('ABSPATH') or exit;

/**
 * Hide WP version in dashboard "At glance" widget.
 * 
 * Bail if current user has sufficient privileges.
 */
function wpt_load_admin_css_overrides() {

  if ( current_user_can( 'manage_options' ) )
    return;

  ob_start();
  ?>
  #wp-version-message {
    display: none;
  }
  <?php

  wp_add_inline_style( 'wp-admin', ob_get_clean() );
}

add_action( 'admin_enqueue_scripts', 'wpt_load_admin_css_overrides', 20 );