I really love to embed soap within soap as you have much more control over the outcome of a specific look you are going for. Here I have embedded thin (1/4") sliced logs of cold process soap into a full log of soap. You get nicely defined decorative elements that are showcased when embedded in a larger loaf of soap. You can also so this using individual molds, but must make sure that the embed is not completely buried by the surrounding soap.
The above two soaps were created using a two step process. First the embeds were made by using an "In The Pot" swirling technique then poured into my 15" silicone log mold - unscented. I did not fill the whole mold, but instead formulated to fill it about 2/3 full. Allowed that to sit for 24 hours to set before removing it from the mold. After 24 hours (this time is dependent on your formulation - mine sets up pretty firm after 24 hours), it is removed from the mold and sliced into 6 long pieces lengthwise.