This picture illustrates one of the methods that I use to select fabric colors for my quilts. First select a fabric that you really like. Along the selvage you will see the color run printed as little circles of color. Select other fabrics in those colors and you really cannot go wrong. This is a simple and quick method, doesn't require a lot of thinking and you get great results.
Sometimes, you will find a fabric and you just love the colors, but you don't necessarily want to work that main fabric into your quilt...again, just use the color band on the selvage as your palette indicator and you can pull together the color combination that you like.