The Big Blue Marble
The term for Earth has been around a little while -- it appears there was a PBS TV series called that, back in the 70s, and it seems like it might have been a quote from one of the astronauts, but I haven't been able to verify it. In any case, NASA has created a composite image of Earth which it calls The Big Blue Marble, with various images of the Western and Eastern hemispheres available from the Earth Observatory site. The image above is based on a northern view of the Western hemisphere. Another similar one I've done using the same basic image is Focus on Our World.