This pattern uses 15 different colors.

Errata:
Strip 4: First rectangle of strip should read:
Cast on 24 sts with SNOW
2 ridges with SNOW
1 ridge with BLACK
2 ridges with SNOW
1 ridge with BLACK
3 ridges with SNOW
18 ridges with BLACK

Strip 6: In the fourth rectangle of the strip eliminate the last ridge. The directions make this rectangle 28 ridges long when all others are 27.

Gauge: in garter stitch 24 stitches = 7 inches, 7 rows=1 inch