Saw someone posted this on reddit, 3dsthem.es got scraped and dumped to a new website.
https://3dsthemesarchive.tk/
https://www.reddit.com/r/3dshacks/comments/6n3e4o/3dsthemes_complete_and_browseable_archive/
https://3dsthemesarchive.tk/
https://www.reddit.com/r/3dshacks/comments/6n3e4o/3dsthemes_complete_and_browseable_archive/