My sister stayed at a resort once where the daily soup was called Soup A La Garbage, not that it was made with garbage but it was made with leftover bits of stuff, like this soap.
The Paisley mold makes pretty soaps from all your leftover soap scraps. Just weigh out 2lbs of melt and pour soap scraps and melt. I wasn't sure what colour these soaps would turn out to be, I had odd bits of various colours, but I think they both turned out pretty good. If you're not happy with the colour once its melted, you can add a liquid colourant or some mica to adjust it.