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The color of Uranus is a blue-green color, and the color of Neptune is a bright azure blue. The reason this is the color of Uranus is due to its atmosphere and its ability to absorb different bands of light.
As in the case of Uranus, the color is due to methane. Neptune would appear darker than Uranus due to dimmer illumination (greater distance from the Sun). Some of the images of Neptune from the Voyager 2 flyby (in 1989) show a deep blue color, but the colors in those images were enhanced. The actual colors of Uranus and Neptune are quite similar. Pluto (no longer a planet; now classified as a dwarf planet): mostly light brown, with some darker regions.