From the Knit Rowan website:

May be knit in worsted or Aran weight yarn: size & yardage requirements will increase with Aran weight.

Knit this fabulous cushion made up of individual textured squares designed by Marie Wallin using our gorgeous yarn Pure Wool Worsted (superwash wool) this brightly cushion will brighten up any sofa.

Finished dimensions:
Completed cushion is designed to fit a 61cm x 61cm cushion pad and measures approximately 58cm x 58cm.

Yarn information:
A - Ivory 101
1 skein
219 yards

B - Grasshopper 130
1 skein
219 yards

C - Bottle 140
1 skein
219 yards

D - Damson 150
1 skein
219 yards

E - Rose Pink 151
1 skein
219 yards

F - Apple 129
1 skein
219 yards

G - Light Navy 153
1 skein
219 yards

H - Seville 134
1 skein
219 yards

I - Buttercup 132
2 skeins
438 yards

Extras:
QTY (3) medium-sized buttons

Gauge notes:
Gauge not given in pattern