I do think scraps breed when we are not looking. About 5 years ago, I went through 6 boxes of scraps, trimming off the unusable bits, cutting the rest into standard sizes, like squares of 2.5, 3.5, 5 and 6", all sorted and compressed into quart or gallon baggies. I ended with half a box of baggies. I shipped several envelopes off to friends and made a bunch of 4 patches and 3 D bow ties. Several scrappy quilts later, that bunch is all gone, mainly to foster kids. IMHO, once they are a bit organized, they tend to be used. One of my fav old fashioned blocks is called vestibule. It takes 4 pieces: 2 of 2.5x5.5, one square each of 2.5" and 5.5. That simple uneven 4 patch eats up scraps like crazy. Sometimes, I use a fussy cut piece for the 5.5" square.