This site has some of our wallpapers, with a big black bar blocking out the signatures, and I've never given permission to anyone aside from AW and minitokyo to put up my walls.
The site is specifically, but I'm sure there's more of AW's walls around here.
The link's too long so you'll have to copy/paste for it to work
Contact at http://whois.sc/www.duble.com
however I haven't gotten any replies.