My ship has come in, literally. Here is the SS Ellen:

I just discovered Shapeways, an online 3D printing service that lets you build your own (somewhat random) spaceship in one of three colors, and have it delivered to your door. You can also create jewelry, your own mini-Me-style action figure, and even iPhone cases based on Soundcloud waveforms.

You don't need to be a CAD expert: there are apps and pre-designed models to get you started. Materials include plastics, metals, sterling silver and sandstone.