TWO COLOR BLOCK:
With F hook and color A, ch-4, sl st to form a ring.
RND 1: Ch-1, *3 sc, ch-2, 3 sc ch-1* join in color B and continuing to work color A in back of sts, ch-1, rep between *'s, pick up color A, ch-1, sl st top beg sc.
RND 2: Working color A and carrying color B behind worked sts: Ch-3 (1st dc), dc next 2 sts, (dc, ch-2, dc) next corner, dc next 3 sts, (dc, ch-1) next corner, pick up color B, (ch-1, dc )sa corner, now working color A behind sts as you work dc next 3 sts, (dc, ch-2, dc) next corner, dc next 3 sts, (dc, ch-1) next corner, pick up A, (ch-1, dc) as corner, sl st top beg ch-3, fasten off.
Join as for basic block only continuing two-color block as established.
Work afghan according to graph.
FINISHING:
RND 1: With Pale Blue yarn and F hook, join in any st on outer edge of afghan, ch-1, even work hdc around afghan and working (2 hdc, ch-2, 2 hdc) in each corner, sl st top beg hdc, fasten off.