3.4 Theme Customizer

<?php
function twentyeleven_customizer_options($wp_customize) {

$wp_customize->add_section( 'twentyeleven_color_scheme', array(
    'title'          => __( 'Colors', 'twentyeleven' ),
    'priority'       => 35,
));

$wp_customize->add_setting( 'twentyeleven_theme_options[text_color]', array(
    'default'   => '#000000',
    'type'      => 'option',
    'transport' => 'postMessage',
));

$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'text_color', array(
    'label'   => __( 'Text Color', 'twentyeleven' ),
    'section' => 'twentyeleven_color_scheme',
    'settings'   => 'twentyeleven_theme_options[text_color]',
) ) );


$wp_customize->get_setting('twentyeleven_theme_options[text_color]')->transport='postMessage';

if ( $wp_customize->is_preview() && ! is_admin() )
    add_action( 'wp_footer', 'twentyeleven_customize_preview', 21);
}
add_action( 'customize_register', 'twentyeleven_customizer_options' );

function twentyeleven_customize_preview() {
    ?>
    <script type="text/javascript">
    wp.customize( 'twentyeleven_theme_options[text_color]', function( value ) {
        value.bind(function(to) {
            jQuery('body').css('color', to );
        });
    });
    </script>
    <?php
}