Color harmonies:triada, complement, analogous, monochromatic
int WrapColor(int colorIndex, int numWheelColors)
{
    while(colorIndex < 0)
    {
        colorIndex += numWheelColors;
    }

    colorIndex = colorIndex % numWheelColors;
}

int GetColorWheelIndex(Color color)
{
    if (ColorWheelArray.Contains(color))
        return ColorWheelArray.IndexOf(color);
    else
        throw new InvalidArgumentException("color");
}

Color[] GetTriadaColors(Color color)
{
    int colorIndex = GetColorWheelIndex(color, ColorWheelArray.Length);
    return new Color[]
        {
            color,
            ColorWheelArray[WrapColor(colorIndex + ColorWheelArray.Length / 3)],
            ColorWheelArray[WrapColor(colorIndex + 2 * ColorWheelArray.Length / 3)]
        };
}

Color GetComplimentColor(Color color)
{
    int colorIndex = GetColorWheelIndex(color, ColorWheelArray.Length);
    return ColorWheelArray[WrapColor(colorIndex + ColorWheelArray.Length / 2)];
}

Color[] GetAnalogousColors(Color color)
{
    int colorIndex = GetColorWheelIndex(color, ColorWheelArray.Length);
    return new Color[] { color,
                         ColorWheelArray[WrapColor(colorIndex + 1)],
                         ColorWheelArray[WrapColor(colorIndex + 2)] };
}