We use our soap scraps from making our bars of honey soap (video to come!) to recycle them into hand soaps using the french milling process. This process begins by shredding the scraps and melting them into a new mass that can then be formed. The form we use is a length of PVC drain pipe that makes soaps 2 inches in diameter that can be sliced into 1/2 inch thickness. Other forms can be used to do the same but in different shapes.
Also, the melted soap can be poured and formed in a shallow pan (such as a cookie sheet) which can then cool and shapes can be cut out with a cookie cutter.