Cut 2 large tomatoes, remove their stem, then slice them into wedges.Peel 1 large cucumber, cut it in half lengthwise, then slice it into bite-size half moons.Cut 1 small green bell pepper into four pieces lengthwise, remove its stem, seeds, and white flesh, then slice it.Cut 1 small red onion in half, peel it, and thinly slice it.
Arrange tomatoes, cucumbers, onion, and bell pepper onto a plate or serving platter.Add 20 Kalamata olives, a sprinkle of dried oregano, a pinch of salt, and a drizzle of olive oil.
Place a block of Feta on the veggies, sprinkle with more dried oregano, and drizzle with more olive oil.