This is a very simple tool to create a dummy image, which is written to a file. It uses https://dummyimage.com to create the images.
npm install -g create-dummy-image
create-dummy-image <options>
Options: --help Show help [boolean] --version Show version number [boolean] --width, -w [default: "32"] --height, --32 [default: "32"] --text, -t [default: "C"] --backgroundColor, --bg [default: "000"] --foregroundColor, --fg [default: "fff"] --output, -o [default: "favicon.ico"]