All icons are available in subdirectories from here:
http://svn.sourceforge.net/viewvc/ph...sources/icons/
This is the one you are looking for:
http://svn.sourceforge.net/viewvc/ph...51&view=markup
If you would enjoy to create a new icon set for Phex check out this file as an example:
http://svn.sourceforge.net/viewvc/ph...00&view=markup
Though this is not completly integrated and documented in Phex yet, we might plan to have different icon sets, if it turns out that users like to build some...