In the first Witcher there was a lot of great concept art used for loading screens, allowing me to just SS the loading screens I liked most and get something roughly 1680x1050 for wallpaper. I can only find small versions of the Witcher 2 concept art, wondering if anyone knows of/has found a place to get more full sized versions.

The GoG version of the game has wallpapers (1280x1024 through 1920x1200) and HQ artwork as downloadable extra content, among other things.

Thanks for the response :)
but...

I've already DLed those and they only have a small selection of mostly character art and typical wallpapers w/logos and such, I'm hoping for ~1680x1050 versions of the art featured here -
http://www.en.thewitcher.com/the-witcher/2/gallery/artwork/