http://css-tricks.com/snippets/wordpress/bloginfo-shortcode/

Wordpress bloginfo shortcode for visual editor

// In functions.php. Creates accessible array of bloginfo parameters
// http://codex.wordpress.org/Template_Tags/bloginfo

function bloginfo_shortcode( $atts ) {
   extract(shortcode_atts(array(
       'key' => '',
   ), $atts));
   return get_bloginfo($key);
}
add_shortcode('bloginfo', 'bloginfo_shortcode');


// in Editor

<img src="[bloginfo key='template_url']/images/image.jpg" alt="" />