For science fiction enthusiasts out there?

hey im running a futuristic dnd campaign off of the d20 system( i know its d 20 modern i just like dnd better) any who i need some good concept art to help design ships that my players will face and live in so they need to be spacious(sorta(also forgive the pun)). need to accomodate dozens to hundreads of people, and must be of varying size and purpose ie: scout merchant warship frigate...ect all help is appreciated. kthxbai!