You would need a gravitational lens so powerful it not only bent light, but made the light perform a complete slingshot around it so that it would be aimed back at Earth. The nearest such object is the Milky Way's black hole, and there's no way we'd be able to resolve Earth in an image coming from a) that far away and b) that close to the galactic core where so much other stuff is in the way.

But could a photon make such a journey? Yes. But you'd never be able to recognize it against everything else.

Is there anything we can do deliberately to use gravitational lensing other than aiming a telescope at a part of the sky where this is happening by random chance?

You would probably need a telescope larger than earth to do this.

Would there be fotons of walking dinosaur still floating around into our direction after making a complete u turn somewhere?