Thanks a lot for the support! We are extremely happy you enjoyed the atmosphere so much.
If you want to make your own wallpaper and feeling a bit arty, a photo mode is available in-game. The community is also really talented and you can find masterpieces here.
Otherwise, the website has a lot of wallpapers here (you will also find concept arts there and video showcasing how Asobo came up with the universe): http://aplaguetale.com/en
Asobo Studio also reveals a lot of concept arts and new content on their twitter.
Concerning prints, I'd advise you to stay tuned .