This pattern was tested for colour blind accessibility by https://www.color-blindness.com/coblis-color-blindness-si... It will also still make sense when printed in the black/white setting on your printer.

Finished blanket will be approximately 17.5
x 13.5 times bigger than your 4-round square.

Not sure if you’re up for making this? Check out the original Eventually Granny Square blanket for free to see the techniques you’ll be using.