Check out this Star Wars and Star Trek spaceships made in paper. “There's a Tie Fighter, an AT-AT, a Star Destroyer, a Millennium Falcon and even a Probe Droid.” You can download the PDF files from SF Papercraft then print and fold yourself. It's very cheap and they're pretty fun, if you mess up just print another sheet and start over again. Go to SF Paper Craft Gallery and start building your own models now.