Chris, I agree -- Night Shift as an EC comic. I'd skip Last Rung on the Ladder, though, and a couple others.
I too, inhumanking, think original content is the way to go. I would even love to see something like a concept mentioned in a novel turned into its own entity. Why not a comic called The Shop? Why not a comic called Derry, featuring Mike Hanlon the librarian figuring out supernatural mysteries? It would be great to see a comic sequel to The Tommyknockers, to see what happened on the ship after it took off, maybe see it land on another inhabited planet, moon, whatever; also, a prequel would be great as well. How about seeing other iterations of Leland Gaunt and his other shops, and perhaps meet some of his colleague shopkeepers? The walking windmill thing from Castle Rock would make a wonderful one-shot. There could me more stories from the mysterious club featured in "The Breathing Method." Exactly what was the Arrowhead Project?
Perhaps an exploration of the Lovecraftian worlds accessible via that eldritch Buick 8 vehicle would be appropriate for a comic. Let's find out what happened to the survivors of the post-Phoner landscape. Would love to see more of the game shows in the world of The Running Man. How many other curses has Taduz Lemke put on people in his life...were they always somewhat justifiable? How about a history of other Long Walks? Maybe Annie Wilkes tortured other people too from the missing-persons file. Is the world fighting 100,000 gray-matter blobs that grew huge in size and started to multiply in the ocean and rise up on land in other countries...can their spores be carried on the winds of the upper atmosphere...did their DNA mutate and combine with H1N1? Are their secret underground franchises of Quitters, Inc. around the country...besides smoking, do they help with work ethic, unruly kids, things like that? How many other Jaunts went wrong, and what were the results? Does Christine have a brother?
King doesn't have to write any of this stuff. He can just license them to Marvel. Marvel could have a field day. And he could bring in more money for his organization with a long-tail business model like this and do all sorts of wonderful things with the cash. His intellectual property and brands could be extended and the value extracted allocated to all kinds of charitable endeavors. And his readership could enjoy consuming some very interesting experiments in the field of graphic novels.