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This is a nice site for creating your own QR-codes: http://qrcode.kaywa.com/

I am just wondering why this is downvoted... I never realized that you could easily create your own valid QR-codes, bumped into this site, and thought it was nice...

Agreed (it might also interest you that you can generate them programmatically using the Google Chart API[1]).

[1]: http://code.google.com/apis/chart/docs/gallery/qr_codes.html

Many applications also let you do that (iOS's quiQR does, for instance).

qrCodes (and other similar codes) are just a physical encoding of binary data.

This is also a great website to generate different types of QR codes: http://zxing.appspot.com/generator/

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