Anything Star Wars is what yoda says. SW battleship is fine and I would have bought it off you had I not been just given one. :D
The only items not SW that are allowed are things that assist with SW hobbies, ie, lathes for making sabers, soldering irons, I guess since we allow sales of SW costumes you could include things that would assist in making a costume like leather working tools, etc.
Items must have some remote connection to SW.
Cool SW iPhone case would be fine but hold the iPhone. Another example of approved and unapproved items.
Hope that helps.