I was very very surprised and amused when I discovered lots of UFO fan art in Pixiv. There is even more fan art of UFO than other series like Space: 1999.

UFO had great stories, FX, characters and plot, but the uniforms and the polyester was kind of ridicule LOL. I watched re-runs of it as a kid and loved it. Just wished they had used more jumpsuits like those from 2001: A Space Odyssey (which is actually older than UFO).