From the pattern description:
Every season each new fashion story offers a reinvention of denim. This cushion invites you to experiment with the knitting equivalent of denim. Lines of bleach are dribbled across neat stripes and left until the colour lifts, giving a rough, checkered effect. However, you can leave the bleach bottle in the bathroom cupboard and just enjoy the denim.

Materials:
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Formerly available at Knitty Gritty link.
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