Our "free" treats include edible veggie scraps from when I'm cutting up our veggies, like tomato & green pepper cores, cabbage leaves cut up... also, ours go totally NUTS for whole wheat grains - wonder how on earth they can even taste anything they swallow that fast!
oh, and it's a good use for bread crusts, crumbled

oh, and it's a good use for bread crusts, crumbled