As with my stand on risotto, I don't like the idea of panini as a dumping ground for leftover food.
However...
When you inventory the fridge and find that you have the remains of a fine roast French chicken...
http://www.thisoldchef.com/blog.html/roast_chicken/
... as we did...
... along with some Gruyére, some dill, and a bit of the most perfect Parmigiano garlic butter...
Well.
I sliced part of a ciabatta open... garlic buttered it... laid on two slices of Gruyére... added strips of perfectly roasted (if I do say so myself!) chicken breast... topped with feathery fresh dill... Then replaced the top half, and proceeded to grill in my accustomed manner...
http://www.thisoldchef.com/blog.html/many_mini_panini_basil__parmesan_sage__prosciutto_thyme__carmelized_onions_with_tuscan_beans/
This was quite a sandwich, believe me. And no dumping ground at all!