SWTOR.com is now providing a Fansite Kit for those fans who wish to make fansites about TOR. I'm not one of them, but I downloaded the kit anyway because it has a lot of great images, wallpapers, screenshots, and concept art all sewn up in one nice zip bundle. I think you can also download them individually from the site (plus more), but I don't have the patience to do that so this was convenient for me.
LINK (
http://www.swtor.com/user/fansite)
You have to be registered to download it but it's free to register.