I followed your lead, but I didn't like the way the img2txt looked. I just wanted black and white.

Then I saw it was unnecessary, qrencode provides ANSI support.

  echo foobar |qrencode -tANSI -o-     #grey, blech

So I threw some sed at it:

  echo foobar |qrencode -tANSI -o- | sed -e "s/\[47m/\[0\;5\;37\;47m/g" -e "s/\[40m/\[0\;34\;40m/g"

But then I looked again, and qrencode provides this to you too:

  echo foobar |qrencode -tANSI256 -o-  # pretty, yay

You can double the output size with:

  echo foobar |qrencode -tANSI256 -o-|sed -e "s/ /  /g;p"

Very pleasing! Might actually use qr codes now.