A wide range of photographs from ALT-C 2010, by Mark Gregory, are available.
You can view thumbnails of the pictures on the Photoshy web site, and Mark has kindly also uploaded high resolution copies of the same pictures. (If you open both URLs in different browser windows, side by side, the former URL provides a usable index for the pictures available at the latter.)
If you reuse any of the pictures attribute them to Mark Gregory, and note that they are licensed by ALT under a Creative Commons "Attribution-NonCommercial-ShareAlike 2.0 UK: England & Wales" license: http://creativecommons.org/licenses/by-nc-sa/2.0/uk/. For commercial reuse contact ALT.