Not just the thing where the QR code is blown up so large you can insert a corporate logo, but you'd feed it a source image and it would make the image itself into a QR code.

I thought I'd bookmarked it but cannot find it and searching around has only found me the type of QR code generator I detailed earlier in the post, which doesn't look like an actual raster image.

(Apparently it dealt better with logos and shapes than full on photos of people but was capable)