This feels like a silly question, but I just found myself wishing there was such a product: Has Paizo ever considered publishing a book of just artwork for various purposes such as depicting event neutral landscapes, terrain, generic supernatural events, bustling city streets...? I know they have NPC decks (mugshots only) and there are plenty of full-body pieces done, but they are not collected, unless you count the Store/Web Blog and Web Fiction images.
I was reading through my campaign setting guide (about Kyonin specifically) and wishing that I had some panoramic images of this forest, and some pictures of this wood and crystal city. A Chelaxian skyline might be cool.
This probably isn't something that would generate a lot of revenue (or whatever the term is), so I have serious doubt that it will go further than this, but I didn't figure it would hurt to ask if it had even been considered. Of course, this coming from a guy who has bought all sorts of "Art of [insert comic/TV show/movie/etc here]" books over the years. I get a kick out of it, but a book with game art could be useful at the table as well.
There's this.