Daedalus was a serious design by the British Interplanetary Society, for an interstellar flyby mission that would reach Barnard’s Star in 50 years.
There’s some more info in this video I made:
Here’s a BIS page on the project:
And another nice article by David Darling.
And here are some of my own renders. I have to admit, I have yet to come up with one I am really happy with – the challenge of a believably lit scene in the dark depths of interstellar space has yet to be nailed by me!