I save all my chicken backs. Wrap them in plastic wrap, then toss into zip lock bags
I just finished making turkey/chicken stock from a turkey breast carcass. I threw everything on a large sheet pan, bones from the breast and all the backs, onions, celery, carrot, garlic, thyme sprigs then roasted until everything was beginning to caramelize, then into a large stock pot with water and cooked away. It turned out fabulous. The batch I made last year, I added a turnip and I did not like the flavor that little vegetable imparted in my stock,so left it out this year. Oh, and I add a bay leaf and peppercorns to the cooking process.