http://www.plastruct.com
At the site, chose "Search/View/Order" on the left. Then go "Product Group" and select "lighting" You will see Fiber optics in that list. I bought some from them and there quality is good!.
Use a sharp razor blade to cut. You can bundle the ends and use electrical tape to put them onto a LED or just cut them into 3/4" to 1" segments to pick up the ambient lighting inside your starship. Just depends how bright you want them to be