Catherine says she once had a friend call her after buying two expensive armchairs that didn't quite match with her sofa. "I said, 'Why don't you buy some throw pillows that go back with the couch for the armchairs, and get some throw pillows that go back with the armchairs for the sofa?'" she says. "She rang me and she said: 'It's brilliant! It works! Everything ties together.'"