I just spotted these little gems over at Mediterranean Life. They are from Spain, and they're called Mariposas. Tim called them "light for the poor". "They're handmade from a thin slice of wine cork, coloured paper and a wick dipped in wax. They're used by floating them on old oil or pork fat, and lighting the wick." Tim tried them with modern lamp oil and said they worked great. I think they'd be great for a party. I'm on the hunt for them.