"Elegance" is hard to pin down. There are tons of Community posts about form customization for you to search. You can start from scratch using my destyled Marketo form: MktoForms2 :: Destyle Marketo form. Another core task is tagging generic wrapper elements so you can style them based the fields they enclose: MktoForms2 :: Tag Wrapper Elements Depending on your needs, you can also alter the default HTML markup. I do this in a lot of the demos you'll find here.
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