Responsive Styled Google Maps is a WordPress plugin by dianamorea that generates responsive (mobile friendly) and already-color-styled maps, using a simple shortcode! There are free and premium versions.
Responsive Styled Google Maps Admin Panel
A shortcode [res_map] is used display a Google Map which is color-styled and mobile-friendly.
Plugin website: http://yava.ro/
Download: http://wordpress.org/extend/plugins/responsive-styled-google-maps/