linux_logo has been showing Linux ASCII art penguins since 1997.
It shows a Linux logo with some customisable system info.
Add the following lines to /etc/rc.d/rc.local
/usr/bin/linux_logo > /etc/issue
/usr/bin/linux_logo > /etc/issue.net
and the penguin appears at all the login prompts, even remote ones.
Maintained by: Steve Kennedy
Keywords: linux logo ascii issue motd
(the SlackBuild does not include the source)