I try to use what I have already purchased, but usually find that my vision does not include the "leftover" fabrics in my stash. I do cut up pieces into 2.5" and 2" squares, hoping that I will make something with them eventually. When I wind up with pieces too small for me to use, I give them to one of the ladies at my LQS. She has a friend who likes to make quilts with a lot of tiny pieces. Suits me ... I get rid of things I won't ever use (like corners, selvedges and trimmings), and she gets free pieces to use. If it's smaller than a 2" square, I give it away.