1. Preheat oven to 400°. Place pastry sheets on a lightly floured work surface, and roll into 2 (8- x 12-inch) rectangles. Pierce dough with fork. Cut each pastry sheet into 24 squares; place on aluminum foil-lined baking sheets.
2. Place 1 tomato slice on each pastry square. Top evenly with olives and feta; drizzle with olive oil.
3. Bake 15 to 18 minutes or until pastry is puffed and golden. Sprinkle with herbs before serving.