Nonethewiser: It is possible to make these stamps not explicit. The color of the faculty and its animal without the stylistics of the coat of arms of the faculties, to avoid copyrights. Red background and lion, green and snake, yellow and badger, tits and eagle And call the set just animals. For fans the reference would still be obvious.

Nonethewiser: that’s the first thing that came to my mind too. Sure, it’d be freaking awesome to have HP house stamps but I doubt Slowly is willing to take the risk, even if done in a subtle way as suggested.

c.elise.t: Yes, that's exactly what I think... I am not an expert, but I don't think Slowly would want to take the risk, although it's for them to decide.

Nonethewiser: I agree. While it could be an interesting set of stamps, there's not much change of Slowly trying to license the rights to use them.

The cost and time needed to manage this is prohibitive for the small staff at the office.