Samuel Taylor Coleridge started a work entitled 'The Wanderings of Cain', set some years after his murder of Abel.

Cain and his son, Enos, are wandering the wilderness. Abel's ghost (or rather, Satan masquerading as Abel's ghost) comes to Cain and tells him that he is suffering horribly in the afterlife, and that to atone for his murder Cain and Enos must follow him across the desert.

That's as far as he got in actually writing it. But, in his notes he says that he intended the apparition of Abel to persuade Cain to offer the blood of his son Enos in sacrifice. An angel then swoops in at the last moment to stop him. So, it seems that Coleridge intended the story to be a reworking of the tale of Abraham and Issac.

Just thought that you might all find that interesting. I have to find SOME use for my English Literature degree, after all.