This vintage pattern is made available by Free Vintage Crochet.
This colorful afghan is crocheted up in 4″ afghan squares. The pattern provides instructions for changing up your colors for the two squares. You could also mix and match this with left-over yarns if you wanted to.
The one thing about an afghan like this is that it takes a lot of work. The crocheting isn’t too bad, but weaving in all the ends can get tedious. Crocheting over the ends and weaving in as you go can help eliminate the work at the end.
The pattern recommends a Knitting Worsted yarn and a plastic hook No. 5.