Before I gained any confidence about color, integration of scale and a host of what seemed to be insurmountable intangibles that go into making a well thought out quilt; I found that if you pick a designer that you like and buy fabrics within their collections that most of the fabrics will integrate well. I gravitated to Jo Morton and used a major amounts of different fabrics in my first quilt and when it was done and quilted, I can still stand back and none of the fabrics scream MISTAKE! The biggest error is to doubt yourself; after all it is your money, time and talent that will transition your purchases into a finished quilt and unless you dress yourself daily to the horrified stares of others, you probably have better color sense than you think.