I suppose I'm a bit too old for this to be on my radar, but I only recently learned of the popular Edgar and Ellen series of children's books by Charles Ogden. They apparently focus on a brother and sister who live in the quiet town of Nod's Limb where they lead a macabre, Addams Family-esque existence. The twins have also been animated for a series of shorts on the Nicktoon Network, and you can check out two of them here and here. A feature film based on the books is also in development.

[via Cold Hard Flash]