The cocoa butter is a vegetable version of tallow. It lends hardness but also takes some of the harshness out of formula. All of the oils in this recipe are pretty pricey these days, unless you buy in bulk. MissMori is absolutely right in urging you to experiment and think outside of the box but I think you will find that some components of soapmaking remain constant. I guarantee you that when we swap recipes that everybody in here automatically begins to tinker. Its part of the obsession to find the perfect recipe. Personally, I don't like seeds, stems, flowers, coffee beans in my soap but other people do. You are sastisfied with your castile but you are looking for something different. My recipe was just a suggestion. I like beef tallow in my soap, don't care for lard, not crazy about Crisco; go figure. HTH Steve