One of our standard lunches now is to choose a quick-cooking grain/even pasta (couscous, orzo, quinoa etc.), add whatever veggies we feel like (sundried tomatoes, olives, and feta is a great combo!), and protein (chicken and/or canned beans- rinsed and drained). I always add a fresh herb and sometimes I'll add a little cheese.
I cook my grain in veggie or chicken stock for extra flavor and add some fresh lemon juice. Couscous cooks in five minutes- so it's really fast to prepare! You can add in raw veggies or sautee them before combining.
For couscous I use the near east brand and I get four servings out of a box with my add-ins! Quick, easy, and yummy! And you could add different things to the same batch to flavor it differently.