Who would have thought that they could improve white noise? But apparently they have, and they call it
pink noise.
The CD smooths out amibent background sound and is used to help with work, sleep and mediation. Earplugs.com recommends it for "medium to lower frequency noises." For the traditionalist, they also offer CDs with white noise, rain, wind and fan. The site provides
sound clips of pink noise and the others.
The Pink Noise CD lists at earplugs.com for $7.95.
(I love the name of this store. They also sell
red, white and blue striped earplugs when you are feeling patriotic. Useful for watching July 4th fireworks, I suppose.)