Finished blanket will be approximately 15 x 12.5 times bigger than your 4-round square. Sample measures 64” x 52”

It is assumed you already know how to join granny squares as you go as in this tutorial: https://youtu.be/jtj8__nYqdU

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.