Have you tried asking the local high school or technical school if they'd be interested in your scraps? Since school budgets are getting squeezed, schools are having a hard time getting art and shop materials.
Our scraps are all timber cut offs. We have a big wooden bin that we put all the cut offs in and set the bin at the end of the drive with a big FREE sign on it. You wouldn't believe how fast they get taken. We even have regulars who stop by the shop and pick them up.