The first thing you are asked to do in any drawing class for homework is to start a sketchbook. Sometimes there are specific things you’re asked to draw, but often the bulk of the pages are up to you as to what you fill them with.
Most working artists keep a sketchbook, too. It’s a repository for thoughts, lists, and…throwaway scraps of imagination and observation: ephemera. And they usually stay that way. The stuff we put in the sketchbook is just practice and things that occur to us in the moment, visually.
But having captured those fleeting shreds, every so often we’ll find a gem of an idea that’s actually a vein of possibility we can mine and turn into something big and meaningful. Keep an eye out, you never know where the scraps will reveal themselves to be more.