So I’ve been reading the Aghora series by Svoboda… India’s version of Casteneda.
Graveyard yoga has been sharply downplayed in the modern world but even Paramansa Yogananda said in Autobiography of a Yogi that he spent time as a teenager, on his own inspiration even before finding a teacher, meditating in the graveyards. It’s instinct for some of these guys that goes back many lifetimes.
Even if it’s not for you, it is still fun to see the world through the eyes of a graveyard yogi and there’s lots of interesting perspectives offered which may be of interest. But don’t read it if you are squeamish… there are many very gnarly situations… R rated for sure… keep these books away from the kids! 
Yoda
Lol… my 3 year old found this book on my shelf and was so obsessed with the gruesome cover that he carried it around for about 3 days. Definitely interesting stuff, although I can’t say that it really influenced me.
Here’s an interesting documentary about an aghori:
http://www.youtube.com/watch?v=vWgW9kh_NjQ
It puts into perspective the difficulty some of us have keeping up with our cumulative hour or so per day of meditation.
Yoda> So I’ve been reading the Aghora series by Svoboda… India’s version of Casteneda.
There is one another interesting book to read, but i can’t confirm this because i don’t have access to this one and only see what is in google books:
Dinshah Pestanji Ghadiali - Master of occultism (Himalayi Mahatma Sakramagogo)
But you are from USA, so you can read this book in library.
An excellent video documentary of a beautiful, renunciate life.
i’ve read aghora 1 and 2 and the books are simply amazing plus you can see a lot of ayp and similar characteristics to those of yogani in there.
but this book might not be easy for everyone to digest, but a great read into one of the world’s most esoteric traditions.
Ananda