Oh, what a pity! My beloved wallpapers site is down for several months now, and despite all those alternatives I really miss them. Their last tweet on their Twitter account is from 2015, so I guess they’re dead. :(
Currently I’m preparing a full dump of the user submissions. If you cannot or do not want to wait, here a some torrents to respective dumps:
Thanks to Yuri Gudilin for those torrents.