Place pita wedges on baking sheet and bake in preheated 400 F (200 C) oven for about 5 minutes or until golden and crisp. Let cool.
Dressing: In a small bowl, whisk together oil, vinegar, garlic, oregano, salt and pepper.
In a large bowl, stir together grape tomatoes, cucumber and feta. Add toasted pita and drizzle with dressing. Toss to combine. Let stand 5 minutes before serving for flavours to develop.