This image of the eclipsed blue moon at APOD is beautiful! The gradient of the penumbral shadow makes the moon look three-dimensional. Not in the true sense of the curved terminator on the moon, but in a “fake” sense of being illuminated by a large surface. It looks like someone is holding a big white reflector behind the sun, say several million miles across.
Oh, and if you're wondering what the “blue” business is about, a blue moon is just a second full moon in a given month. Usually there's only one.