We generally just do a picky plate at lunch.
Usually:
One of: chicken, tuna, ham, sausage, salmon, Spanish omelette, boiled egg
Three of: tomatoes, cucumber, pepper, carrot, avocado, sweetcorn, mushrooms
One of: wrap, bread, bread sticks, crackers, rice cake, pitta bread, bagel
One or two of: grapes, apple, mango, blueberries, strawberries, satsuma, raisins
And often a piece of cheese. Sometimes houmous or peanut butter to dip the veg in.
If it isn't this then it's normally a hot omelette or scrambled eggs (no good for you obviously). Or beans/soup and toast/crumpet/bagel.