In a large bowl, marinate tortellini in Italian dressing for 30 minutes. Chill. To assemble skewers, start with two pieces tortellini, one cheese cube, two spinach leaves, one pepperoni slice (folded in fourths) and one tomato, then repeat again. (Each skewer will have total of four pieces tortellini, two cheese cubes, four spinach leaves, two pepperoni slices and two tomatoes.) Repeat until 16 skewers are made. Refrigerate until serving.