This is an icon set displayed as part of Pete333's CatBlack GTK 2.x theme. Pete333 provided a link to the ftp site where the files were located.
After doing some research I was unable to determine the author, and the website did not list distribution restrictions.
This is a very nice icon set and I felt it should be available here. If anyone knows the author for the set please let us know.
http://www.technoware.com.ph has other linux downloads including distro ISO files.
Sorry no screen shot is available. I'll work on that.