Just type banner followed by a phrase of your choosing to create a huge text banner. For example, banner Welcome to Low End Mac will create a banner out of the phrase "Welcome to Low End Mac."
It's pretty neat to watch it flow across the screen, but you can actually make a printable version.
First let's change directories to your Desktop:
Then create a new blank file called banner.txt:
Now type your banner command, followed by > banner.txt:
banner Welcome to Low End Mac > banner.txt
The ">" directs the output of the previous command into the specified file. Double click the banner.txt file on your Desktop, and you'll see your printable banner in your default text editor.