StoryBoards just draw them 
 
You can easily create templates in most creation software
Word, Publisher, Excel, illustrator, Paint, Photoshop etc etc etc
I have an illustrator template at college
it's like
code:
   ________
  _    _     _    _
|_|  |_|  |_|  |_|
 _    _     _     _
  _    _     _     _
|_|  |_|  |_|  |_|
 _     _    _     _
Which works out having title of piece at top, squares along rows then a line to explain what's going on in each