Couldn't decide whether to put this in Books or Arts... Arts won.
An artist I stumbled upon, M.S. Corley, redesigned the covers of the Harry Potter books to look like Penguin Classics. He also did the same for the Lemony Snicket series. They haven't actually been published like this... he just did them as kind of a fun experiment.
Some people have commented that, even though they're nice, Corley didn't capture the true spirit of Harry Potter. Meh, I still think they're pretty cool.
Here are my favourites of the HP series:
Source: http://mscorley.blogspot.com/2009/02/harry...r-redesign.html