A little trick I learned recently (and making even more use out of "waste") is to save the mushy stuff leftover from making stock and add it to soups and stews. I just separate the bones (though, if they are soft enough, I blend them up too) and put it all in the processor until it makes a nice paste. It will look pretty gross, don't worry. Add a few big spoonfuls to your soup as it simmers, and it will add flavor, depth, richness, and extra nutrients!
Enjoy the soup weather!