I made some cheerier (but not too girly and flowery) cushion covers for our 60 cm sofa cushions. I really like them. However, I didn't notice when I bought the material that it had quite some stretch to it, as it just looked like cotton poplin. When I sewed the zips they puckered quite badly. They look pretty awful actually. I did try the zip method from the Bend the Rules Sewing book, which I think on normal fabric would have worked just fine. My husband has promised to halt the cushion police at the door if they ever turn up to inspect the cushions.