They are not totally unwearable, but they are clearly past the point of giving to Goodwill or otherwise passing on to another shoe-wearer.
I could make large, vaguely disturbing art with them (merely arranging them on the floor counts as large, vaguely disturbing art, really) but I don't need large, vaguely disturbing art any more than I need three identical pairs of worn-out black sneakers.
I am leaning towards saving the laces (because string is always useful, right?) and throwing away the shoes, but I feel ever-so-slightly guilty about that last little bit of not-totally-unwearable-ness. Can you think of any use to wring out of three identical pairs of worn-out black sneakers?