From the Knit Rowan website:
Knit this homeware felted cushion, a free pattern to download as part of the Trent Homeware Online Collection. Designed by Nottingham Trent University student Justine Thornton using the gorgeous yarn Creative Focus Worsted (wool and alpaca), this cushion is created in a unique way by placing coins underneath the stocking stitch fabric, tieing them in place with thread and then felting to create this stunning effect.

Finished dimensions:
Completed cushion measures 40 cm (15½ inches) by 60 cm (23½ inches) after washing.

Yarn information:
Photographed in New Fern 01265
6 skeins
1320 yards

Extras:

• Approx 200 coins of various sizes
• Strong cotton thread
• 40 cm (15½ inches) x 60 cm (23½ inches) cushion pad
• 42 cm (16½ inches) x 62 cm (24½ inches) fabric for back.