I've made Nizzy's whipped soaps a few times, lots of fun. I really wish my cupcake deco skills were a little more Martha, if you KWIM, but still they were neat. I frosted cupakes made with cocoa butter scented with Birthday Cake. Smelled positively edible. Teen-aged girls loved them!
They were really easy to make, just follow the directions precisely and be mindful of the temps.
The soap I made on the other hand left a little to be desired in the longevity department. It was a good soap, nice feel, but didn't last. I didn't realize when I made it that most people find whipped soaps to be short-timers. Maybe it has something to do with all the minuscule air pockets holding in water?