Make the dressing: Combine the olive oil, lemon juice, garlic and a pinch each of salt and pepper in a jar. Shake well.
Make the salad: Bring a pot of water to a boil. Add the orzo and cook as the label directs. Drain and let cool.
Combine the orzo, chickpeas, red and yellow tomatoes, olives, feta, parsley and red onion in a large mixing bowl and pour the dressing over the top; stir to combine. Taste and add salt and pepper, if needed. Refrigerate at least 1 hour before serving. Top with more feta and parsley.