You could make roughly the same each day but a bit more interesting (and having the ingredients there can mean they go into different meals over the week, too);
Porridge could be with a different flavour each day - Cinnamon, Cocoa Powder, coconut yoghurt and walnuts, maple syrup and pecans, frozen blue berries, frozen forest fruits, peanut butter and grated apple, add the seeds you were originally intending for dinner sometimes... .
Omelette - could be cheese (the stronger types don't need as much for the taste), could be mushrooms, cherry tomatoes and peas, add chopped fresh herbs, add chilli sauce, spinach, edamame beans, courgettes, tofu, chilli, etc. Could change to poached or boiled eggs, or separate yolk and white, whisk the white, fold in the yolk, cook, grate on pecorino, grill for a souffle omelette...
Soup - easy. Stock cubes, assorted vegetables, stick blender, soy, etc. Can do broths with mushrooms, tofu, soy, ginger, peas, etc. Or change up for a tinned tomato based one with herbs. Or add a potato for a thicker texture without adding a roux. Or using tofu/aqua faba to thicken. Frozen veg is brilliant for this, as you can add bits and pieces as you feel like it. A dash of toasted sesame oil, a pinch of sesame seeds and some chilli is very nice, as is a quartered boiled egg, cherry tomatoes and peas in a soy sauce seasoned stock. There are different types of noodle with different nutrients - soya bean ones, rice ones, buckwheat (rinse under the cold tap after boiling before adding to the soup so they don't clump together).
Fruit/snacks. Sometimes they can be cooked. Some people like baked apple with cinnamon (do two, then one can be added to cinnamon porridge the next day), seeds can be used in sweet or savoury, as can nuts.