I was taking a break on another project and made a simple fork, and started stretching it out and extruding bits, then slapped in a couple of keyframes to make it fly around, and made it into a spaceship on a whim (here’s the original fork/ship and animation):
By that point it had grown on me, so I cleaned it up a bit, composed my image a bit more, did a little bit of compositing and called it done (the first image is the final render). Probably spent less than an hour on this overall.