I don't know if there are any other GWAR fans on here but I recently finished Dave Brockie's AKA Oderous Urungus' debut novel "Wharghoul". It was a pretty wierd one, as you might expect, but also pretty dang good for a first novel. If you enjoy vivid, disgusting description and disjointed timelines, this book might just be for you.
He also has it for free on his website. GWAR is a feast for the eyes when viewed live!! HAve you read anything else from DEADITE PRESS?
I haven't read anything else from Deadite Press but some of the titles advertised in the back of the book looked pretty interesting. Typically I read more fantasy/sci-fi than horror/gross-out stuff but I couldn't help myself this time because I've been a huge GWAR fan since I was in 5th grade. They do put on amazing live shows.