I found this beautiful image of the asteroid Lutetia on The Planetary Society Blog (Color Portrait of Asteroid 21 Lutetia by Emily Lakdawalla, Jul. 21, 2010) that was captured by Rosetta on July 10, 2010. As you can see it has a beautiful and unusual color. I was particularly struck by the following comment:
When he sent me the image, Ted remarked to me something that I’d been thinking: “That is one funky crater on the terminator. I would probably suspect it was of something other than impact origin if it was on, say, the Moon.” I totally agree. It’s just not the right symmetrical shape, and it has a weird round lip at its edge, and that dark halo above it. I’ve got no idea what it is, but it doesn’t look like the other craters.