Stable Diffusion is in the news a lot, along with other AI image editors such as MidJourney and Dall-E.  It is open source

One popular tutorial for making QR codes that are more artistic https://stable-diffusion-art.com/qr-code/

If you want to follow along on your own desktop you'll need to follow the following tutorials

• https://github.com/AUTOMATIC1111/stable-diffusion-webui - this creates a standalone server that will run on your local machine at http://127.0.0.1:7860/
• https://stable-diffusion-art.com/controlnet/ - this extension adds a series of plugins that control the output of the AI Model by interacting 

Cost: Free open source

Use cases: generating a wide variety of imagery based on keyword prompts and as part of generalized workflows

Support: Discord and google are the best sources for support