Man, found some great possible flags:
National Council of Astronautics from 2001. I didn’t even know this flag existed, and now it’s all I’ve ever wanted.
Lots of great Futurama flags. I love the Globetrotter homeworld and the Neutral Planet flags.
Close Encounters of the Third Kind’s science team
If I want any of these and can talk K into any of them, I might have to resort for making them myself. I would have to learn how to do that.