"My most beautiful sound at the time was a tatty green BBC lampshade," she recalled. "It was the wrong colour, but it had a beautiful ringing sound to it. I hit the lampshade, recorded that, faded it up into the ringing part without the percussive start.
[For Blue Veils and Golden Sands] I analysed the sound into all of its partials and frequencies, and took the 12 strongest, and reconstructed the sound on the workshop's famous 12 oscillators to give a whooshing sound. So the camels rode off into the sunset with my voice in their hooves and a green lampshade on their backs."
The lampshade in question is the Coolicon Utility Lighting Shade, British Patent No 419602, Registered Design No 777912; they sometimes appear for sale on ebay.