First, those who only know him from his novels may not realize this, but Neil Gaiman got his fame with this essentially pop culture medium, writing comic books, most notably The Sandman and the initial story arc of The Books of Magic. There are several cross-references between American Gods and, in particular, The Sandman and its spin-offs, all pulished under DC’s Vertigo imprint.
The Sandman is excellent and remains strong for a long time. If you ever want to sample it but don’t want to get tangled in a long story line, I recommend trying issue #50 (June 1993), which has a lovely standalone story. If you like it, try buying the collected books from the start; if you don’t like it, this comic is probably not for you.