I own more than one book about color and this one is my favorite. It's an inspiration recharge for me because the subjective effects of the color schemes are included. As I flip through it, some schemes grab me and put me in a mood, which then unlocks a cascade of designs.
The book seems to be geared toward interior decorating, so of course it would be wonderful for those who design home decor, but it works for me for fashion too. The newish home decor magazine, Domino, tends to tie in fashion and accessory trends.
Flipping through this book is a fun way to use up your yarn stash with updated color combinations. If you have 2 colors in your stash and you find an inspiring color scheme using them, then just bring the yarn and book with you to shop for a few balls of these colors, an you've got yourself a very stylish project (afghan or whatever).
Keeping a folder of multicolor stitch patterns near this book would result in some fresh, exciting swatches!