This is a modular knitted blanket, so it requires no sewing. There is an Icord binding around it with corner knots. These could be added to go all the way around if you wanted.

The yarn amounts are for the 28” square blanket. More yarn is needed for a larger blanket. You could get an extra ball of the colorspun and another of the second solid color and have enough to add another row of squares, maybe two.