I have freely translated and adapted the flyer on the wiki.
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Hello Alessio,
There are some rules about Fedora colours and logo we should follow [1].
Usually we work together with the design team and we prefer the ticket opening for this kind of stuff.
So I'm not comfortable with that and it seems the page you linked is a bit outdated.
Please open a ticket in the mktg pagure in order to discuss what's done.