The thought I have is that you can choose a fabric from a line of fabrics that you like. In this way there will be fabrics that you know will coordinate and you are not trying to choose from a whole world of fabric. You would be able to choose from that line. I also choose fabrics with some contrast, but I know people who prefer no contrast. This is just a personal preference.
Purchasing a quilt kit can be a good idea if you can find one you like. I enjoy choosing my fabrics and cutting them, so I only buy a few kits.