I make foundation-pieced crazy quilts, so I can use virtually any size or shape piece! As long as some fabric will show once I put in my seams, I can use it; and if it's a batik I will sometimes just topstitch it down and leave the raw edges exposed so I can REALLY use tiny pieces there. Some people do a lot of applique with itty bitty pieces too. So I think it will really vary from person to person.