This is the icon theme used with the web apps in the newly-released XXCE (Xubuntu Xtreme Cloudy Edition) 8.04.1. It is based on the gOS Space icon theme with new icons added and designed by Yours Truly. In addition, the web apps included with XXCE Linux are included in the tarball.
To use this icon theme and the applications, unzip the tarball.
Untar the icon theme tarball and copy the extracted folded to /usr/share/icons.
Untar the applications tarball and copy the contents of the folder (not the folder itself) to /usr/share/applications.