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Hi Chris,
Hoosh Marketing has an Email Template Builder that allows you to quickly create customized emails, with no coding required. You can create and edit the template in the tool and paste the html directly into Marketo.
There is a Free trial available on the website.
Very late to this thread, but if a drag and drop builder for true Marketo email templates is still something you might need you should check out EmailVariant: https://www.emailvariant.com/. It has 27 pre-built modules and comes with all the global and local variables you might need to fully customize and create as many template variations as you need!