I am in the process of making that quilt right now. I am using a group of fat quarters that were coordinated and I have added to them. It is very scrappy, but controlled scrappy, if you know what I mean. I am doing it just as your pattern suggests, 2 colors per square. Most of my fabrics are in the medium range, so the contrast is coming from opposite colors on the color wheel, and contrast in the size of the prints, or floral and plaid, etc.... I am doing mine with hand applique so it is the project that goes with me wherever I go. You may have to do a few blocks to know the look that you want. I've done a couple that probably won't make it to the final cut, I bought new fabrics for more recent blocks that I like better than some of my first choices. If you want the pattern to shine, then you may want to narrow your fabric choices down, if you really want to use all those fabrics then the pattern may not be as obvious, which is fine as long as that is the look that you are after.