I've recently made a "Working Hands" soap for sale for my charity. Basically I took the base recipe (which could be any you fancy) and added about 15% extra oil weight coconut oil (bringing the superfat up to about 20%), 25% oil weight sea salt, 5% oil weight pumice and 2.5% oil weight coffee grounds. I didn't scent it but used very strong coffee left overnight to cool and stew a bit to make the lye, keeping the grounds in. The coffee aroma stuck quite well and it was very dark brown with darker speckles in colour. You could use a coffee scent I suppose. All of the testers loved it, especially the men. It is VERY scrubby. The only criticism I have of it is that towards the end of its use when its got to a small stump it tends to break up - probably because there is not actually much soap left in it! Apart from that it is one of my favourite soaps.