I'm one of those who only buys for projects. I don't have room for a stash. That said, when I do purchase, I always buy a bit extra. Usually 1/4 to 1/2 yard extra. Gives me comfort if I make a cutting mistake. After my quilt is completely done, I will usually keep some larger pieces of the leftovers but sometimes not. I do like to have a bit of fabric on hand in case I see some cute little project that I want to do in the interim. I'm not a 'scrappy' quilter. I tend to be very traditional in my quilting style. Whatever I do keep I just have in drawers in a dresser in my sewing room. I've become friends with another QB person who is local to me who does much charity sewing. The fabrics I don't want to keep I give to her. Works for both of us.