I always like poster art. In particular, I like the way poster artists manage to make such effective use of a limited color pallet. Several of these are excellent examples:

Exoplanet Travel Posters

[Update 2016-02-14: That link seems busted, but a search still finds the exoplanet posters: http://www.chungkong.nl/?s=exoplanet]

With just a few shades of the same color, the Chungkong paints a whole alien world.

—via Jay Lake.

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