Wallbase is down according twitter account www.twitter.com/Wallbase
This summary should be updated.
Now is www.alpha.wallhaven.cc/..
Also can be used for searching high quality wallpapers this sources
www.interfacelift.com/
www.wallpaperfx.com/
www.desktopography.net/
www.uhdwallpapers.org
evan.rogers
Evan joined
Musician and gamer - all in one :)