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I love these Stylecraft Chunky yarn colours together and they work up well in cushion cover. The chunky yarn seems to give a beautiful stitch definition and seems to work perfectly with the herringbone half treble stitch.
Find the full pattern here.
This pattern is for a 50cm x 50cm cushion but can easily be adapted to whatever size cushion you desire. It is super simple to make. Suitable for a beginner.
I used a 6mm hook.