I think there used to be a program called banner, but that doesn’t seem to be around. I found figlet.
__ _ _ _
/ _|(_) __ _ | | ___ | |_
| |_ | | / _` || | / _ \| __|
| _|| || (_| || || __/| |_
|_| |_| \__, ||_| \___| \__|
|___/
http://www.figlet.org