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If a spaceship were made only for interstellar travel (without re-entry), presumably a sphere would be the best shape, for reasons of volume-surface area efficiency, and pressurizing. Maybe this would also make omnidirectional solar power simpler, but that might not really be efficient.
Space warships would probably want to be as small as possible, and would probably be no larger than their main gun, to most limit their target silhouette.
A massive gun (or missile platform, etc) equipped with some propulsion systems, and a one story building on top to house the crew. That would be all.
Spaceships like the ones in sci-fi are very much like what an ancient Greek would have imagined if you told him that in the future people would fight wars in flying metal machines. Instead of a fighter or a bomber, he'd imagine some kind of Archimedean contraption that would look like a chariot pulled by wooden Pegasuses, and which would bring their riders in close enough to chop and hack at each other with flaming swords.
People often look back at Sci-Fi from the 1940s and '50s and wonder how people could have thought something so obviously ridiculous was cool. I think these starships will become like that for this time period.
Of course I don't have any qualifications to say what starships will actually look like either, but I feel pretty confident that they won't be ornate galleons with bridges and wings with square-rigging.
