I always have leftovers because I rarely know exactly what I'm going to make when I buy fabric, so always have scraps - or more - to play with. I often make extra blocks because usually I end up with one or two that are "off" and that gives me the opportunity to set those aside and use the good ones. These leftovers are stash to me, as I don't really buy much fabric unless I have an idea brewing. I always think I'll do something with the leftover blocks, but at this point, they just sit around.