[EduartBoudewijn]

For the people who are looking;

Here's a clip of the climax of the movie, where the witches all turn into rats: https://www.youtube.com/watch?v=QsuIp03FENc

Here's a clip of an often overlooked little scene, where one of the witches who works in the kitchen tasted the soup before the rest and turns into a rat before the rest: https://www.youtube.com/watch?v=f9VMxVCdBYo

Here's the clip of the protagonist's tranformation: https://www.youtube.com/watch?v=VpK8lMH0lhA

And of Bruno's transformation: https://www.youtube.com/watch?v=Rtf8uPmgq0A

As far as art related to this movie; I can only think of two pieces that I've seen around.
There's this piece: http://fav.me/d500r67 which shows the american witches using the potion on a child at their convention.

And there's this sequence by Jitenshasw, which isn't really related to the movie, but was supposed to involve the same kind of process as the movie: 1 - http://fav.me/d653otj
2 - http://fav.me/d653p6i
3 - http://fav.me/d653pa0