Her New Orleans comes out as a wonderous place as she takes her characters through its shadier sides. Lost Souls is a vampire book, but an interesting and almost frightening view of the lives of a dying race and its newest children, and the impact they have on the mortals they encounter. Drawing Blood is extremely hard to describe. It is about two people who, through various events, come together in a small town in North Carolina, and what becomes of them. Exquisite Corpse is about the art of killing, and those who are the artists.
Wormwood is a collection of short stories written by Poppy.
I highly recommend all of these books. Her books may not be as influential or as well known as those of Anne Rice or other authors of the day, but they are written as well, if not better, and they create just as effective a world.