I guess similarly you can carefully craft a poster with a QR code and put it on a wall in a room with two LED bulbs. The bulbs will have different color temperature and the decoding will be dependent on which bulb is lit.

Another idea would be a poster that's not quite flat: Each pixel that is different is slightly raised (pyramid shaped) and the sides of the pyramid is colored differently. So the QR code scans differently from different sides.

One of the dominant banks here in Tbilisi allows sharing of IBAN number as QR codes. In theory, the trick could be used to steal money, but in practice, there are many safeguards such as the banking app displaying the name of the beneficiary before completing the process.