@Albonio, if someone makes something, it belongs to them, not the people who 'made the idea mainstream'. That's like saying a glass bottle hat is copy right because there was a glass bottle in the background of one scene in Fast and Furious 4. I can actually think of many witch hats with faces on them in another games and movies, so it does not really belong to Harry Potter. On the topic of copyright, that Hershy's chocolate kiss hat though <3
Oh, they added 2 more colours of the mage hat, blue and purple.