Glossy quality crochet cotton or fil d’Ecosse size 20. Steel crochet hook US size 9 (1.25mm) or size for gauge.

Advanced. Popcorns; working in chain stitches. Shown on a square pillow.

Pattern 5, page 18 in Magic Crochet.
Pattern 25, Pudestykke, in Haekling; photo p. 58, chart p. 45.
Pattern 11, Turquoise, pillow topping on turquoise square cushion in Crochet Monthly, #220.