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8" by 8" test palette of hue triangles, in 5 subdivisions of the full nominal colour range, arranged in a square diamonds format. The colour rainbow can be traversed as if outlining the semi-regular octagon and square grid. The gaps between pure colours (RGB and CMY) are covered by hues which are simple fractions: half, thirds, quarters, fifths and some sixths.
If you want the grey-scale included on this as well, ask for that variant to be uploaded. It fits into the otherwise blank squares between the hue triangles and spoils the look of the design somewhat as a piece of repeating art.
• (off-site) diagram of hexadecimal codes
• more palette designs
• design index