30988-plugin.php

<?php
$foo_color_default = '#f00';
$foo_text_default = 'Lorem';

// These add_option() eliminate the need for supplying default values for settings, 
// and it eliminates the need to supply the 2nd $default arg to get_option()
add_option( 'foo_color', $foo_color_default );
add_option( 'foo_text', $foo_text_default );

add_action( 'customize_register', function() use ( $foo_color_default, $foo_text_default ) {
	global $wp_customize;

	$wp_customize->add_panel( 'foo', array(
		'title'      => 'Foo',
		'capability' => 'edit_theme_options',
	) );

	$wp_customize->add_section( 'bar', array(
		'title'      => 'Bar',
		'capability' => 'edit_theme_options',
		'panel'      => 'foo'
	) );

	$wp_customize->add_setting( 'foo_text', array(
		'default'    => $foo_text_default, // not really needed because add_option() call used with default supplied
		'capability' => 'edit_posts',
		'type'       => 'option',
	) );

	$wp_customize->add_control( 'foo_text', array(
		'label'    => 'Foo & bar',
		'section'  => 'bar',
		'type'     => 'textarea',
	) );

	$wp_customize->add_setting( 'foo_color', array(
		'default'    => $foo_color_default, // not really needed because add_option() call used with default supplied
		'capability' => 'edit_theme_options',
		'type'       => 'option',
	) );

	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'foo_color', array(
		'label'   => 'Color',
		'section' => 'bar',
	) ) );
});

add_action( 'wp_head', function() use ( $foo_color_default, $foo_text_default ) {
	var_dump( get_option( 'foo_color', $foo_color_default ) ); // second argument not needed since add_option() call used
	var_dump( get_option( 'foo_text', $foo_text_default ) ); // second argument not needed since add_option() call used
});