my suggestion: go online and save as or just copy then paste into Photoshop doc. If you want a separate document to alter it in, right click the picture on the internet>copy; then in PS, new image>ok>paste. You can find lots of free images of stuff. And surely you will find a UFO/alien craft/starship, what have you. Somebody said it the other day, "google is your friend."
If your image is really high resolution, you might have some issues, but there's a trick you can do using layer effect emboss to sharpen up a picture and it works really well. But just keep looking till you find one that's large to begin with. Otherwise, library>check-out>scan>return book before due date. :mrgreen: