#6 seems to harken back to a 70s space ship. #3 and #4 have colors that look very 80s, but #4 looks more sci fi. Not seeing any 70s or 80s sci fi theme in #1. Just looks like an abstract design to me.
Taking main inspiration from some cool looking circuitry to hit the "sci-fi" part of the 70's and 80s. It looks good in a couple different hue's but I think the red blue makes the boldest impression. Any feedback welcome!