They've been mentioned but Lucio Fulci's City of the Living Dead and The Beyond are considered to be part of the Cthulhu mythos. They're both apocalyptic horror films with overt references to Lovecraft and the Cthulhu mythos (City of the Living Dead being set in a town named Dunwich and The Beyond having a book called The Book Of Eibon being an integral part of the plot). Highly recommended films for horror fans.