Most of you will already be familiar with “white noise.” In audio engineering this is a sound that has a flat frequency spectrum and no single bandwidth has any more prominence than another. Some people describe it as “static.”
There are other sounds that have color associations, just as pink noise (said to help you sleep better), red noise, blue noise. There’s even an infamous brown noise that is said to provoke you to crap yourself.
Here’s an online noise generator where you can listen to white noise, pink noise, and brown noise. Listen at your own risk, I take no responsibility for any mess you make after listening.
Quirks and Curiosities 