FIGlet is a program for making large letters out of ordinary text.

$ figlet -f univers Gareth.

  ,ad8888ba,                                           88
 d8"'    `"8b                                    ,d    88
d8'                                              88    88
88            ,adPPYYba, 8b,dPPYba,  ,adPPYba, MM88MMM 88,dPPYba,
88      88888 ""     `Y8 88P'   "Y8 a8P_____88   88    88P'    "8a
Y8,        88 ,adPPPPP88 88         8PP"""""""   88    88       88
 Y8a.    .a88 88,    ,88 88         "8b,   ,aa   88,   88       88 888
  `"Y88888P"  `"8bbdP"Y8 88          `"Ybbd8"'   "Y888 88       88 888