Mailchimp & Responsive Framework

Hi,

I like the styling of the email sign up widget on the responsive framework.
I would prefer to use mailchimp for collecting emails and sending emails.
What would be the best way to do this?

*Get a mailchimp sign up form and styling it like the PP one OR
*Use the PP for initial sign up and synch with mailchimp (pref automatically!)
*Some other solution?

Thanks!

Rob