Last year, we had a thread in which people showed off some of the great ship designs they created with Galactic Civilizations II.
With the expansion pack adding so many new components and so much free form support, we'd love to see the cool things players create.
The cool thing in the expansion pack is now you can save your creations as templates and then assign the computer players to make use of those ships in various roles. Combined with the capability of creating your own custom opponents, now you can create your own sci-fi universe within GalCiv without modding.