$ figlet moo! | cowthink -n
 ___________________________
(                        _  )
(  _ __ ___   ___   ___ | | )
( | '_ ` _ \ / _ \ / _ \| | )
( | | | | | | (_) | (_) |_| )
( |_| |_| |_|\___/ \___/(_) )
(                           )
 ---------------------------
        o   ^__^
         o  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Links:

• Cowsay
• Figlet

$ cowsay -f small -s fr3nd rules
 _____________
< fr3nd rules >
 -------------
       \   ,__,
        \  (**)____
           (__)    )\
            U ||--|| *

$ cowthink -f sodomized -w not again!
 ____________
( not again! )
 ------------
      o                _
       o              (_)
        o   ^__^       / \
         o  (OO)\_____/_\ \
            (__)\       ) /
                ||----w ((
                ||     ||>>

$ cowthink -f three-eyes I came from outer space
 _________________________
( I came from outer space )
 -------------------------
        o  ^___^
         o (ooo)\_______
           (___)\       )\/\
                ||----w |
                ||     ||

$ cowsay -f bunny I wanna carrot
 ________________
< I wanna carrot >
 ----------------
  \
   \   \
        \ /\
        ( )
      .( o ).