NOTE: not maintained since 3.8 or so, looking for new maintainers! A port of XPenguins to gnome-shell! See extension home page for explanation of configuration options. Includes the basic xpenguins themes, and compatible with the original xpenguins themes: more can be found from http://xpenguins.seul.org.
Note: Binary files aren't shown on the web site. To see all files, please download the extension zipfile.
Updated for GNOME 3.6. Because every desktop needs armies of penguins walking all over it :)
XPenguins