The Official Star Wars web site just introduced a fantastic new feature for creating “photo mashes”. That is, to mix classic Star Wars photographs with your own personal photographs to create humorous and interesting mashups. Enjoy! I will post my own creations as and when I make them.
Of course, there is this:
Any original art, envelope art, comics, illustrations, news, stories, meeting information, or any materials voluntarily submitted become the property of Lucasfilm. No compensation will be given for voluntary submissions, and there is no guarantee of publication. Submissions to starwars.com will not be returned. By submitting content, you are stating that the work is original, and created by the person submitting it.