Personally, if it was going through the Stephen King, website I wouldn’t use any image taken off the internet, even images not from the movie. There are rules that allow you to manipulate an image and not run afoul of copyright laws, but they’re complicated. And I’m sure we don’t want there to by any possibility of a hassle for King. If the shirts were made elsewhere for a small run and not sold for profit, you would probably be fine. But to offer them through stephenking.com you must be very careful. The one I did with the axe is okay, and the two below would be okay, as I created them myself without any image captures. But I’d stay away from all the others I presented. (note: the text the first one below is copyrighted, but I doubt King would mind in this case )
Since that text (iconic as it is) wasn't even in the book, I agree he probably wouldn't care. Spot on with all the rest, though.