I think they were saying that you print out what you want, glue it to a magnet, and put it on the door.[/QUOTE]
You can send a message to LittleMissMagic and see if she will do a custom cruise design for you. Here is a link and just send her a message. http://www.mousebuzz.com/forum/arts-crafts/57707-mb-design-thread.html
Then you go the the office store and get magnet paper and print them out. I have not hears of anyone’s printer not being compatable, but I would think you can read that on the back of the package.
I have also seen people just print out on regular paper and then have it laminated and stick magnet tape on the back.
Good luck, I have been on several cruises but not tried to do any magnets.