2 comments

1. There’s no default way to do that yet, though there is a Trac ticket. I found this (untested) that may work for you: http://www.devblog.fr/2011/05/16/plusieurs-fonds-personnalises-wordpress-add_custom_background/

   It’s also worth noting the 3.4’s new way of defining a default background (still just one, though).

   Edit

   Here’s the code:

   <?php
   function wpse48332_setup_theme() {
       // Add support for custom backgrounds
       add_theme_support( 'custom-background', array(
           // Background color default
           'default-color' => '000',
           // Background image default
           'default-image' => get_template_directory_uri() . '/images/background.jpg'
       ) );
   }
   add_action( 'after_setup_theme', 'wpse48332_setup_theme' );
   ?>
   

   (Note that you can also define front end, admin, and preview style callbacks, as well.)

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2. If you can, add this snippet to your theme functions.php file, if you’re using version under WP 3.4:

   add_action( 'after_setup_theme', 'add_custom_background' );
   

   Or if you have setup function for your theme, just add this call to it:

   add_custom_background();
   

   After you added it, new menu item “Background” will appear in your admin panel. At this page you can select custom background image or set background color:

   

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