Beyond White Noise

You've heard of white noise. Often broadcast to mask the common day-to-day sounds heard in offices, or public spaces, white noise lends an aural privacy to an environment because it distracts the ears with a din that's steady, yet unimposing.
Have you heard of pink noise however, or brown noise? The site SimplyNoise.com offers a free generator for these colours of noise, so on the nights when rain on your roof isn't lulling you to sleep, this application will. No word yet on when chartreuse noise will be developed.
