This color in St. Patrick's Day email is “must to”. Leprechauns, alcohol and, of course, cloverleaf traditionally used too.
St. Patrick's Day Email Design Ideas
You mustn't make a separate template for St. Patrick's Day. The festive mood is created with the help of small details: cloverleaf, a pot of gold coins or other themed decors can be added to the logo, buttons or email background. And don't forget about discounts!