I make my scrap quilts this way:
Cut squares of newspaper the size I want the squares. Starting at the center, I pin whatever material I grab out of the box onto the paper pattern. The next piece is placed wherever on the first one. After folding over the seam width, I top stitch the piece onto the first piece. Tear the paper away under that piece and cut away the extra fabric underneath. Continue until the paper is covered. Cut your new square of material around the paper pattern and remove the rest of the paper. From the wrong side you can clip away any extra left hanging.