To begin, loosely cast on (long tail over 2 needles) an even number of sts with
color C.
My colors: color A = light blue, color B = medium blue, color C = dark blue

Row 1 color A:*k1, yf sl1yo, k2tog; rep from *, end with k1.
Row 2 color B: *k1, yf sl1yo, brk1; rep from *, end with k1.
Row 3 color C: k1, *k1 skip st under yo, k the yo (leave it on the left needle),
then k the skipped st, slip both sts from needle; rep from *, end with k1.
Repeat Rows 1-3.