Different Site/Theme for mobile viewers

Greetings WordPress,

I just had a quick question and idea for my website (http://lobo-rivera.com).

I’d like the website to show a different theme (Grunt) for the viewers viewing from iPad’s, iPhones etc etc.

If there is a plugin or a how to on how to do something like this, please point me in the right direction! If need be, i’ll resort to directing users to a mobile domain (m.lobo-rivera.com) like the olden days.