If you have ever seen Star Trek Insurrection, I built a model of the scout ship that Data flies at the beginning. It looked dead on like it, and the model was sturdy enough to be thrown across the room from a height of 5 feet and not lose a single brick.
My favorite thing I ever build was a space base with a small fleet of ships. I had a wing of fighters based on the fighters from Babylon 5, several science vessels, a small battleship with a crew of 2 that had movable engine naecells and missiles that you could detach, and lastly a capital ship with a crew of 8 LEGO dudes. The only things remaining today are the capital ship and the battleship. Both are with my mom in Montana (along with all my random bricks).
And I couldn't agree more with the coach. I ALWAYS ALWAYS ALWAYS had matching color schemes. I also did all the little details like the vents (what I called the little 2x1 flat brick that looks like a vent), antennas and what not.
BTW I used to be huge into Star Trek and it influenced many of my creations.