Wash and chop the green pepper and cucumber into bite-sized pieces at add them to a large bowl. Slice the red onion and add that too, along with the grape tomatoes.
Add the red wine vinegar, olive oil, basil and oregano to the bowl with the veggies. Toss everything together very well.
Add the crumbled feta cheese, and toss to combine. Sprinkle the Kalamata olives over the top, and you're done!