QR Codes are a great idea but they are big and ugly. You can customise them to a degree, but they still lack personality. For example, here are some I made to print as Moo stickers:

There is also the Microsoft tag, but that looks even worse.

I wonder if it would be possible to create another type of code that works in the same way, but instead of generating a random checkerboard pattern, it created some kind of face. I’ve quickly drawn up two examples of what these could look like (at the top), but I imagine a much more detailed/abstract look would be required to accommodate the amount of information they would need to contain.

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