I originally typed this up for my Traveller site, and I’ll be using this for my Gurps Space planets. Created in Open Office Writer, then printed to png with the bullzip printer. Yes, its watermarked.
"Welcome to my GURPS Space site; these maps and other graphics are only for playing Space/Science Fiction type games. They are copyright and not to be used for other purposes. If you have them on your site, please remove them. Thank you."