Don't toss those units! There are many ways you can use them. The first thing that came to mind was on the back of quilts. I donate to a charity who requests blocks every other month & any left over (orphan) blocks that aren't used in the first original quilts are put together by a very, very talented contributor who has such a special gift of being able to make those blocks look like they were specifically made for the quilts she assembles from them. It is a special gift she has that she uses to help this charity...nothing goes to waste.