Last summer, I was in the excellent shop DreamHaven Books in Minneapolis, when I stumbled upon a used copy of John Thompson's Book of Dreams from 1977. It has a sort of a day planner format, with dated boxes where you can fill in your dreams from that night. But the best part is, each month begins with one of Thompson's full-page pen and ink drawings, which are examples of spiritual psychedelica at its best. I bought the book for maybe $4 or so, knowing nothing much about it, except that it was neat.
Since then, I've had trouble finding out more about him, other than the fact that he was a contemporary of R. Crumb, and was involved in the legendary underground comics and poster art scene in San Francisco of the time. I don't even know if he's still alive. His drawings show a deep interest in esoterica and erotica, and often blend the two in complicated and highly imaginative imagescapes. This site has a great slide show of his work, and I highly recommend you watch the whole thing. You can also read more about him and see some more examples of his work here. I think it's truly extraordinary, and wish there were more books and web sites about it.