Unfortunately, I can't post any shots as I don't have the books anymore, but I do remember that "Flashback" had some real cool stuff in it. Without any doubt, for me, it's one of FTD's better book/CD sets. Can't say if any of the photos featured in it are rare anymore but certainly cool all the same.
As far as "Writing For the King"... it's not a photobook. It's "just" stories from the people who wrote songs Elvis recorded/covered... but definitely worth the money if you're thinking of buying it!