There are three folders.
Solar--Coldness: this is the metacity theme
Solar-Coldness: this is the Gtk style theme
SolarColdness: this is the icon theme
I packed them all in one TGZ. To install just copy "Solar--Coldness" and "Solar-Coldness" in your Home directory in the hidden subdirectory "/.themes" and copy "SolarColdness" in /.icons (again a hidden subdirectory in your Home directory)