In Stephen King's journal, he describes an idea he had for a novel. It appears to be referring to Rose Madder, where Rose does actually buy a picture in a pawnshop and discovers she can step into it.
Meanwhile, I have an idea for a novel about a lady who buys a picture in a pawnshop and then kind of falls into it. Hey, maybe it’ll be Mid-World she falls into, and she’ll meet Roland!
- Coda: Pages From a Writer's Journal / September 22, 1922