Talk about a blast from the past, some of these Dutch science fiction book covers are unworldly and dark with some really talented illustration work. What I like about these is that you can see how well the type selection and drawings play off each other in a complimentary fashion. Try looking at each of these focusing on this connection to interpret them in an interesting way.
Great example of cohesive design--the letters match the looks.
via Horzel's Flickr