This is the site I use to generate the picture:
http://qrdroid.com/generate/
As you can see, you can do a website (url), some text, contact information, etc.
Then it will make the picture, and you can break it up from there.
There are some marketers that think QR codes are terrible. I think they have some potential for things like this, or for companies with hard to spell websites and email addresses (says the person who runs archaicarcane
) I have these codes on the cards I give to people to give them a better chance of getting email to me.