I tend to find an object with colors I want to bring into a quilt but my ideas change as I go along.
Working on scrap quilts I feel has stretched my color skills and I would recommend it. Working with 2 or 3 inch squares I can make some odd combinations of HST but not make any commitment to using each one. Many I made using the paper bag/random draw but others I picked out to play with color and contrast. Then I can see how each HST plays with surrounding combinations of colors.