I have been using olive oil, parsley, Italian Seasonings, salt, pepper, and feta cheese. I mix that all together, then toss it into the salad. I also have been adding a chopped boiled egg, which helps too. I have found these toppings to be very tasty.
I noticed that a lot of crumbled feta has something in it to keep it from sticking together, so I am only getting the blocks.