Another suggestion, if you have trouble picking out enough different colors is to pick a fabric that you like, that has several different colors in it. usually, along one side of the selvedge will be colored dots- those are the colors in the fabric- you can then take that fabric, and the dots and match up colors. It is sometimes easier for beginners than trying to guess at the right colors or shade. I love scrap quilts and 20 years ago or so, I recognized that they were missing enough contrast. For a couple of years, I made myself buy remnants by weight and feel, regardless of pattern or color, and I began to use some truly ugly fabrics. And what i found was that a 4 inch piece of ugly fabric can sometimes pop in a quilt, and it no longer looks like itself.