Isis, I have bought those squares on ebay before for a good price, but haven't used all of them yet. By the time you pay shipping and handling on these squares though, it doesn't end up being a bargain. 20 squares won't make much of a quilt, so you'd have to order several sets (depending on how big you want your quilt.) If you stick to the same color, it would make a really pretty scrappy quilt, so don't worry about using them. Sometimes, I pick fabric first and then find a pattern I like that I think would look nice for those colors and fabrics. Other times, I find a pattern I love and then pick fabric for it. One way that I use (and recommend for my beginner students) for choosing fabrics is to pick a print, maybe a nice floral, that you love with several colors in it, then match those colors in other fabrics. You can mix a large floral with small florals, or a plaid or stripe, but if you like quilts that are less busy, choose fabrics that are tone on tone or small prints. But the bottom line is that you must love your choices! Then you can't go wrong!