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.

House Atreides

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.