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OK. No problem. Nasa normally have these images for people to download online but the way they are arranged makes it difficult to find the right ones. Will have a look myself when I have time.

guys, i'm not from NASA. I just use the Chrome browser, right click and select Search Google for image and came out with some results.
try theses:
https://www.nasa.gov/mission_pages/NPP/news/earth-at-night.html#.V5rQ7Lh97b0
http://visibleearth.nasa.gov/view.php?id=55167
there are some links in the above pages to download similar images.
quite stunning I must say.
@ace108