Tuna or Salmon nicoise are always lovely. I prefer steaks but tinned or jarred fish will do fine. Boiled eggs, green beans, black olives, anchovies (optional) and I just do a simple vinagrette with balsamic or whatever we have. Could add cherry toms for more veg.
I recently did a mozzarella and grilled peach salad which was LOVELY, balsamic glaze and pine nuts added to it.
I also do a 'healthy' Ceasar salad, parmesan shaving, grilled chicken breast, spring onions, asparagus and then a dressing with greek yoghurt as a base and then other typical ceasar dressing ingredients.
Chicken tikka salad - marinated chicken breasts (or turkey or fish), greek yoghurt and lemon juice as a dressing, grilled peppers, red onions, plenty of lettuce (or do as lettuce wrap)
Mexican taco salad - marinated chicken breasts (or turkey or fish, or skip meat altogether and add roasted butternut squash), plenty of lettuce, coriander, lime juice and a bit of tabasco as a dressing, black olives, sweetcorn, peppers, spring onion