wp-custom-iris-color-picker.php

<?php

/* .... some other theme functions ... */

/* Custom Default Colors for WP Colorpicker */
function theme_name_color_palettes() {
    if(wp_script_is('wp-color-picker', 'enqueued') ){
?>
	<script  type="text/javascript">
		jQuery(document).ready(function(){
			jQuery.wp.wpColorPicker.prototype.options = {
				palettes: ['#ffffff', '#000000', '#bdd54a', '#b0dfe4', '#f192bc']
				};
		});
	</script>
<?php
    }
}
add_action('admin_footer', 'theme_name_color_palettes');
add_action('customize_controls_print_footer_scripts', 'theme_name_color_palettes');

/* .... possibly more theme functions ... */