So I've been trying my hand at m & P and decided that I wanted to make a multi-purpose layer soap. I imagined it to have a moisturizing layer, a scrubby layer, a foaming layer, etc, etc. I tried to over saturate the scrubby layer with sugar so that you could feel the grains, but they eventually smooth over. any suggestions for the scrubby layer? Walnut shell? Jojoba spheres? I dunno. Waiting for all you brilliant soap geniuses to chime in.