I've been looking for Aion wallpapers for a while now and it took me a while to get my hands on some proper ones. Not just screenshots taken by players, but real wallpapers. The wallpapers you see are made by NCsoft and all rights belong to them. For the source of these wallpapers, head over to this site. You can get different resolutions there as well.

For those that want 1920x1200 wallpapers, here they are (be warned, each one of these is about 1-2mb):