I know of a guy that took his date to a car wash. And at the end, the car wash guy held up a towel that said, “Will you marry me.”
Maybe bec it is not done in my circles, it seems childish to me. Marriage is a serious thing, not a contest of who can come up with the most creative way of breaking it out! IMO, save your creativity for your first anniversary, at that time, make the wackiest, most romantic, funfilled shtick, that you can treaure as a married couple.