I often make Greek salads using romaine (and another lettuce if I have it), diced cucumber, tomatoes, bell pepper, minced red onion (that's been soaked to remove some of the bite), halved kalamata olives, cut up marinated artichoke hearts, kidney or garbanzo beans, dressing that's heavy on the vinegar and a few shakes of oregano. Like
@Jules, I sometimes add a chopped cold baked potato (nearly always have those in my fridge).
Also make my own version of the "Jennifer Aniston salad" (which she says she didn't invent, nor did she eat it every single day while taping
Friends, but said she often eats salads for lunch that include some whole grains).
Anyway, my version starts with a quinoa or brown rice base, garbanzo beans, diced cukes, diced tomatoes, diced bell pepper, thawed frozen peas, thawed TJ frozen roasted corn, finely chopped mint and Italian flat leaf parsley, green onions, lemon juice, a little (emphasis on little) olive oil and a smidge of salt.
Instead of the olive oil I sometimes mix homemade hummus with the lemon juice and a little water and stir that in as a dressing.
On both of the above, just before eating I sometimes add fresh blueberries, strawberries, grapes or other fruit. I cruise my produce drawers and add in whatever seems like it might be good additions.