Beyond its templates and familiar features ... Pick the one you like, and use the options to adjust the colors of the QR code ...

SpringPublisher lets you create letterheads and business cards with simple templates, including maps and QR codes. It works well, but sacrifices some design control. Setting up a small business ...

You can also tap the paint palette icon bottom-left to change the background ... can pick a simpler template, not bother with the logo or graphic, and just put in the QR code and enough details ...