Actually this is for the page layout but you guys might like to take a look too.

http://www.youtube.com/watch?feature=player_embedded&v=rQz3tiGL77Q

Check this out.

This is done with Illustrator.
The process is roughly....
1. Draw lines with the pencil and smooth tools
2. Object > path > outline stroke
3. Adjust the vectors to look like pen strokes
and a few shapes and copy and paste thrown in here and there.