This is a log cabin-style aran weight blanket with a little bit of a difference. Traditional log cabin style blocks are worked but rather than overlapping at the corners and building on the layer below, small mitered squares are used instead to add visual interest.
The sample shown was knit in 2 shades of West Yorkshire Spinners BFL Aran (cream & neutral brown) and the dark grey was Lopi Lettlopi - dark grey heather.

Materials and measurements:

Yarn: Approx 600g aran yarn (3 x 200g in 3 shades)
Yarn A: dark grey
Yarn B: cream
Yarn C: neutral/brown
Needles: 5.0mm

Gauge: 16sts and 30 rows to 10cm (4") in garter stitch
Finished size: Approx 37" (95 cm) square