I do the same thing. I buy from a fabric collection. I buy a layer cake or jelly roll or a fat quarter bundle and some yardage from the collection so I can make a complete quilt top from that line. I have many fabric collections. I even buy charms. But I always buy yardage to go with whatever precut I buy. I also buy 5 1-yard cuts for "It takes Five" patterns. You need five 1-yard cuts to make the patterns. It's easier for me when I find a quilt shop and don't know what to buy.