Using colored paper is the only way I can stay organized considering the enormous amount of papers that cross my desk everyday. I'm a high school teacher and I try to color-code to maintain my sanity.
I bought this so that I could color-code different classes' handouts. In teaching 150+ students a day it becomes a nightmare at the end of the day if everything that was handed in to me IN ADDITION to my papers I use from which to teach are all white. Using color-codeing helps me to identify whose papers are whose!