[Note] This screensaver has been replaced by the new Eternity Screensaver.
The obvious choice for possessing your screen when it’s idle is the XFlame screensaver. This is no longer part of the standard Ubuntu packages (it’s hidden in the xscreensaver-data-extra package), but can easily be installed (see below).
A pentagram looks fantastic (suggested by JT Hundley). Here’s a bitmap which can be used:
I suggest installing xscreensaver and xscreensaver-data-extra alongside gnome-screensaver. We will still use gnome-screensaver as the default, so no functionality will be lost:
First, make sure you have the universe repository, see the following link for instructions:
Then, add the packages:
sudo apt-get update sudo apt-get install xscreensaver xscreensaver-data-extra
You change the image shown by XFlame by editing the Exec line in its config file, eg:
gksu gedit /usr/share/applications/screensavers/xflame.desktop
Exec=xflame -root -bitmap /usr/share/pixmaps/pentagram.bmp