From the Knit Rowan website:
Knit this striking homeware cushion from Rowan Knitting & Crochet Magazine 56 as an exclusive free download, a design by Martin Storey using the wonderfully soft machine washable worsted weight yarn (wool.) This square cushion has a geometric triangular design on both sides. This free pattern PDF has also been translated into French, German, Dutch - only print the pages you need after downloading.

One size only in stated instructions with recommended yarn
Finished dimensions:
Completed cover fits a cushion pad 53 cm (21 inches) square.

Yarn Information:
A - Damson 150
3 skeins
657 yards

B - Periwinkle 146
1 skein
219 yards

C - Jade 127
1 skein
219 yards

D - Magenta 119
1 skein
219 yards

E - Grasshopper 130
1 skein
219 yards

F - Gold 133
1 skein
219 yards