There are several color-related templates (and more can be found in Category:Color templates).

{{color-stub}}
{{color swatch}}
#003BAF

Ultramarine[1]
#003BAF


{{colorsample}}
Inline color sample. Handy for hexadecimal (#AD6A4B ) color values.
{{swatch-inline}}

#00FF00

{{web colors}}
{{EMSpectrum}}
{{WikiProject Color|class=|importance=}}

To be emblazoned across the talk pages of every color-related article and non-article color page

WikiProject iconColor Unassessed
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Deprecated templates, per new proposal

edit
{{swatch}}
 

purple

{{infobox Color}}
A color
 
      Color coordinates
Hex triplet#AAAAAA
sRGBB (r, g, b)(170, 170, 170)
CMYKH (c, m, y, k)(C, M, Y, K)
HSV (h, s, v)(0°, 0%, 67%)
CIELChuv (L, C, h)(70, 0, 0°)
Sourcesource
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)
To be used on each article about an actual color. The format is not necessarily final, and there has been some desultory discussion as to which color spaces should be included.
The format has been recently changed to add link to an explanatory article and to allow for reference the source of any coordinates used. For information on this, please see the talk page and the more recent Infobox Suggestion.