I always use the carcass for stock, then freeze it in smallish batches to use in soup etc or gravy or whatever.
We've just finished today's roast chicken. Tomorrow, we'll have paella:
fry onions, garlic, a little tiny bit of chilli till soft
add in some slices of chorizo
then some peppers, red, orange and yellow
add some rice
then add chicken stock, I usually soak a bit of saffron in boiling water too and add that
once it's nice and soft, add leftover chicken and some prawns.
Should be enough for two meals or one meal + freeze some more
OR
Butter chicken
marinade cooked chicken in yoghurt with crushed garlic, crushed ginger, a bit of chilli power, cumin powder, coriander powder, turmeric, garam massala (or any spices really will do)
heat up a tin of tomatoes for a few minutes in a pan
heat up the chickeny yoghurt stuff,
add a knob of butter to tomatoes
once melted, add a slug of cream
mix it all together
serve with rice.
Both recipes, make sure the chicken is really heated through.