I buy and use them all. We have so many beautiful choices now days that it's hard for me to just pick one of two fabrics in a line, so layer cakes are a favorite of mine. I also search out layer cakes for I spy quilts as the variety is already there. That being said, if the fabric is on sale will buy a bit more and not on sale will get 1/2 yd to 1 1/2 yd. as I do a lot of scrappy type quilts. If you like less busy quilts, buy larger amounts of fabric.