I know the book release/movie premier has come and gone but I made some shirts for my friends too because I was so excited. I'm a little older so I was jokingly calling us "Dumbledore's Middleaged Army" but it was all in good fun.
On the back it says: Or... The Ministry of Magic are Morons Group.
It was a simple t-shirt but it got a lot of comments when we went down to "Diagon Alley" to pick up our book.