Maybe in the background put in some cranes and towers similar to those seen in the Star Base 11 matte paintings. Those are very iconic. Or else something similar to that, like you might see at Disney's Tomorrowland or the Space Needle or some other 1960's-vision-of-the-future type structure.
If not the whole tower, then maybe just enough structure to imply one is being built...
Also I second the pennant type banner for the UFP stuff.