What do you put in your salad?

I'm trying to get creative ideas of reinventing a simple salad without adding a ton of calories. More of a "get enough leafy greens in for the day" salad. I like getting my calories elsewhere. If that makes sense.

Typically I cut some romain to mix in with baby spinach, squeeze some lime, tomatoes, sometimes cilantro if I have, sometimes a little onion, garlic salt and call it a day. I'll add an avocado if I have any. It's enough to fill a big bowl. Very refreshing with the lime and cilantro combo. Then I'll have my main meal.

While I love this, I want to try other combos before I get tired of it.