Materials:

4-ply worsted-weight yarn in 100-gram/3-1/2 ounce skeins—five skeins of Slate Blue and three skeins each of Dark Slate Blue and Light Slate Blue (Nancy used Cascade 100% Monsanto acrylic 4-ply knitting yarn)
size H/8 (5mm) crochet hook or size needed to obtain correct gauge
size 16 tapestry needle
scissors