I once had a bar of Greek olive soap that left a very slight oil-like residue on my skin after use, and I totally loved how that felt. I'm not quite sure why the soap was that way; maybe the oil hadn't saponified completely or something. The bar looked perfectly normal though, dark green with maybe a slight transparent quality to it (it was long ago, my memory may be slightly incorrect). I have never found such a soap again (my parents had brought it back from their vacation and I have forgotten the brand name by now; this was from before every shop was on the internet), but if anyone can help me find one, that would be really great.