Some have said they add good ingredients to a melt and pour base to make their soaps. One thing you have to remember- the melt and pour is NOT natural; it has a ton of chemicals, some of which are bad for you. (see my blog on my website and my note on fb titled "It Has What in It?." 
Also, melt and pour base soap is made with lye, as is any soap. Lye is necessary to make soap, so if someone tells you their soap does not contain lye, it's a lie. No lye, no soap, no lie. 
A quick note about saponification: Soap, in it's most basic form, was probably discovered a few thousand years ago by ancient priests.  In those days, priests made sacrifices by burning the carcass of an animal on an altar built out of rocks. Wood was used to build the fire.  As the carcass burned, fats would have dripped down to the bottom of the altar, and the ashes would have also fallen down to the bottom. Rain water mixed with wood ash creates sodium hydroxide, also called "lye".  Fats saponify when mixed with lye and water.  That is, a chemical reaction occurs, creating soap. So the soap found at the bottom of the altar was primitive, but it was soap - a basic necessity gift from God.  How cool.