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We did create a banner for this purpose, and we include it in every update, but since we don't require that contests use it, it's not standardized. Members are welcome to use our banners and graphics for their contests, but it is not required.

Response accepted as a qualifying submission.

Don't forget you can also earn points by scoring the clarity and helpfulness of other qualifying responses.

Rating 4 - Doesn't give an example, and the idea of personalising a banner, for non-technical people, would be overwhelming.

Rated 3. Nice idea but it still doesn't answer the question "do you have a banner I can use?"

Rating 3

Doesn't answer the yes/no question in the front. At least you can give example(s) if there's no standardized banner.

Rating 3, not really answering the question