I designed email templates in MailChimp mainly for webinar blasts to Envision IT's full list of over 12,000 users. I used a similar structure for most of the emails, and worked on all of them through HTML and CSS.
These are a few examples of templates I made for webinars:

Statistical Analysis
I also used MailChimp's built-in functions for statistical analysis and research on our users. By improving our designs each time, we were able to create user retention and increase number of attendees consistently. These are some of the statistics of one our webinar on "Azure B2B and Guest Management Best Practices."

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