There isn't a film without a story -- well most times anyway. Pretty pictures can only go so far.
As with all art, part of the process is telling YOUR story. It may be purposefully executed or it may simply be part of the process. Each of us, I believe anyway, leaves a piece of ourselves in every film. We may do it purposefully, or it might just surprise us. Either way it is part of the film making process.
So the next time you are stumped for a theme, try picking a single word or a thoughtful phrase. See where it leads you. If you are honest with yourself and free in your interpretation (no self editing now) the story may uncover things about yourself you did not know.
Sometimes good, sometimes bad -- ALL of that makes up who we are.