Here's a bit of one of those long thought about story ideas that recur through my sketchbooks every now and then. Sometimes the stories start with an actual narrative to fill out like The Pudding Factory. Others work the other way, slapping bits of ideas around until a story somehow connects them together.
This is a sketchbook page showing a Zombie Highwayman who goes on to terrorize a country hotel. It's one of slapping together ones.