When I make a roast chicken, I usually get 4-5 meals out of it. Chicken tacos are great- I usually have a bell pepper and an onion laying around, and sometimes an avocado...
I slice a bell pepper and an onion and sautee them in a very hot cast iron skillet, to get that little bit of char like they were grilled. It also makes that fun sizzling, like those fajita platters at chain restaurants (Fun fact! fajita means skirt steak, sooo no such thing as chicken fajitas). Then I add some shredded leftover chicken, and lots of cumin, chili powder and maybe cayenne. I mashed up an avocado with some lime juice, spread that on corn tortillas, topped it with some cilantro, and piled the chicken- pepper- onion stuff on top. And then I took a picture, because it looked great. 
