I've just put up a brief video on making your own QR codes. I guess everyone has seen QR codes, but not everyone has used them, but they're quite useful! I give a brief explanation in the vid.
For some reason, a lot of people use services on other people's computers to do this when you really just have to install
qrencode, which is a pretty simple program to use.
I illustrate it in the video for those of you too intelligent to just run