Here's another one...made it while on vacation last week.
Chain 140, 150 or 160 depending on how large you want the blanket...I used a K hook... All single crochet
*1 row black, 1 row white, 1 row black, 3 rows solid, 3 rows variegated, 3 rows solid and repeat from *.
If single crocheting is to slow for you try half double crochet it would work just as well. I find sc very fast to do. This took me
4 nights while on vacation...