Yeah, we already have a cast the characters thread, so it's probably be best to limit this one to stuff that actually shows the characters/ships/ect. how they would appear in the books. So if you're going to use photos they should probably be photoshoped or somehow altered so they represent the character and not just pictures of who would play them.
I'll leave to finalized rules to Relayer1, but that's my take on it.
I did have some very rough Photoshops I did of several characters that I was going to post. But all I could find was copies in a word document, and it wouldn't let me copy them onto the boards.