As much as I love reading and writing books, I'm also a complete sucker for great cover art. My bookshelf is heaving with books of all genres, especially 60s and 70s sci-fi and horror, which I bought in part due to the cover art.
Here's a few fan art covers which Richard Ellis (@bookartguy) has shared on twitter - and that I'd like to share here as I think he's really caught what these two books are about. I'd buy these if they were in print, despite already having the books. Enjoy.