all of the fabrics in those pics are a FQ done in a single color and i only mixed enough dye to color that single FQ.
when you do a large color wheel like i did you'll mix up a larger amount of the primary colors (blue, red, yellow) and then just combine them to make that one single color.
so you might start with a 1/2 cup of the 3 colors (red, blue, yellow) and then you just put a teaspoon or two to make that shade.
the recipes from the book are given for a FQ or a yard. i have doubled and tripled the recipe when i wanted to dye 2 or 3 yards of the same color.