xcowsay is a graphical configurable talking cow. It's a GTK+ version of the classic cowsay Perl script. It displays a cute pop-up cow on your desktop with a speech bubble and some customizable text. It comes with a fortune(6) wrapper script, xcowfortune, which you can cron to deliver periodic fortune cookies via the cow. It even has a daemon mode that lets you send the cow's messages over DBus.