I did this by using an online QR Code generator and an app that let me create a Wallet card for my iPhone. The app is a shopping card generator, and I used a custom template to create a new card ...

There are a variety of QR code generator apps out there, but for a good general solution, you can create a QR code via Chromium-based browsers like Chrome and Edge.

I tried and succeeded in generating 'readable QR code illustration'. ciaochaos shows several sample patterns. Below is a QR code using traditional Chinese patterns.

This QR code generator is free to use, though you can pay a one-time $6 fee to remove ads inside the app and get extra features like an unlimited number of QR code scans. Google Chrome.