It is sooooeasy to make a mis-cut,I now call them mess cuts. However, I always find a use for them, and for my orphan blocks, too. Mess cuts can be pieced together and always make a wonderful tote bag, for instance. I am working on a cotton scrap crazy quilt, and it doesn't matter about the size of the fabric as long as it's at least an inch. .
So fear not, you will find a use for the fabrics and you will enjoy making the test blocks in the future. I make my test block out of anything I happen to have, just to make sure the sizes are right and I enjoy making the block. In the beginning, I thought making the test was 'wasteful.' I have now decided otherwise.