My latest writer’s block antidote! I am writing in a sketchbook with really long pages, meaning that page breaks come at different intervals, which I find refreshing; also, I allow myself one illustration per page at maximum, so when I write something that would make a good picture, I have the treat of sketching it (at the top of the next page) to look forward to.
Also, the sketchbook means that I can easily draw things like floor plans (see fig. 2), which is useful for visualizing interiors. Ten points, good for absolutely nothing, if you can tell me what famous place I based my floor plan on.
So, in summary: put the laptop away and write on paper, especially unlined, oddly-proportioned paper. And draw pictures.