You mean like this:
wp_enqueue_style(‘mytheme_colorstyle’, get_template_directory_uri() . ‘/css/color.css’,false,‘1.1’,‘all’);
Or you also are referring to renaming the sylesheet itself too?
like this:
wp_enqueue_style(‘mytheme_colorstyle’, get_template_directory_uri() . ‘/css/mytheme_color.css’,false,‘1.1’,‘all’);