Reconstructed from an archive.org backup of /r/carbon by /u/ggitaliano. Currently deployed on /r/Carbon_Copy.
Last CSS: https://b.thumbs.redditmedia.com/6OltOW6Xbz1dZNVKJfoWSbtycXGThq6mGDiNtEeOQTw.css
Can be applied to your own subreddit by using carbon.min.css and uploading all of the 'images/' files along with it.
The 'header/snoo.png' should be set as the header in your subreddit settings.