APOD 3.4: Belt of Venus: http://apod.nasa.gov/
Although this looks like the typical sky during twilight, the slightly off coloration of the sky near the horizon is what's known as the Belt of Venus. This coloring can be seen in just about every direction during sunrise and sunset. In the belt of Venus, the atmosphere reflects light from the sun, creating the red-pink color shown in this picture. Below the belt, very little light is reflected, thus causing the area slightly above the horizon to appear somewhat darker. This is a really beautiful picture of the sky, and I will definitely have to start paying more attention to the sky during twilight hours!
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