A Freespace 2 conversion would be good, although you'd have to make up a brand new planetside system. Also, Star Trek could be done as GT suggested, and Paramount would be a bit pissed but they can't really stop you...
Also they've got a totally different type of game coming out anyways.
Paramount can do a
LOT to stop you if they so desire - and I wouldn't be surprised if they did - they don't really like seeing Star Trek content in Star Wars games. There have been a few CnDs both ways around with this before.
I wouldn't be so sure of that
People seem to be thinking too inside the box for my liking, too many space game mods, how about something different, like a pure earth based mod with chains of islands to capture and sea battles, or something that takes place in the sky with floating fortresses and air ships and stuff, or even stuff in alternate dimensions. Don't get me wrong, space based mods are cool, but I just think they're too like vanilla EaW.
Well, it's the immediate thing that springs to mind for most people. What disappoints me most of the time is 'wouldn't it be cool to put this game into EaW' mod ideas. Get some originality, if you want to play Starcraft, PLAY STARCRAFT.
Oh and you wouldn't be stealing my 'Neo Orthosia Gothica' concepts there would you
? (Sky based islands, flying battleships, cyberspace....)