My favourite witch-in-training, Mildred Hubble, was the subject of a whimsical and enjoyable series of books by Jill Murphy about a girl, aka 'The Worst Witch,' who was more than a little accident-prone and had a habit of getting into trouble or finding her spells not going *quite* as planned!

One of my favourite things about her was the fact that when it came to having a familliar, she was last in line an at Miss Cackle's Academy for Witches and somehow ended up with a tabby cat instead of the usual black cat.
I highly recommend these books as they are a thoroughly entertaining read, never a dull moment as things so often go (hilariously) awry for poor old Mildred!

There was even an enjoyable TV show based on these books, which screened around 1998~2001!
Find out more about the Worst Witch here.
Other Halloween-flavoured treats (no tricks, I promise!):
http://www.bookortreat.com/2010/10/27/halloween-gift-tags-for-books/
http://www.domestifluff.com/2010/10/free-printable-mini-owl-treat-boxes/
http://blog.craftzine.com/archive/2010/10/sock_zombies.html