Preview Genesis Child Theme Color Options

functions.php

add_filter( 'body_class', 'yourtheme_preview_color' );

function yourtheme_preview_color($classes) {

	if ( isset($_GET['color']) && !empty($_GET['color']) ) {
		
		$current_theme = wp_get_theme();
		$queried_theme = $current_theme->stylesheet;

		array_push( $classes, $queried_theme . '-' . $_GET['color'] );
		
	}
	
	return $classes;
		
}