You know - this is my blog!
It took me to this site, in swedish but I'm sure you could find one in english, Skapa QR-kod. So easy - you just write what you want to say and press a button and it turns to a QR-code!
I do have a QR-reader on my phone but haven't used it many times, perhaps it will change now.
I don't know what to use it for, but it is fun!