I have a small silicone dragonfly mold (my favorite) and after I have made the loaf of soap and cut it I use left over end pieces from the loaf to roll and press into the dragonfly mold. I unmold it carefully and attach it to the bar of soap in whatever fashion I choose. I use alcohol and water to attach it. You wouldn't believe how strong the bond is. I do the same with the oval layered bars