How do you add custom color swatches to all WYSIWYG editors?

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Click on the Custom... text and the color picker will pop up. Pick the color of your choice and press OK. Chosen color will appear as a custom swatch for later use.

Note! The solution above is not a solution. See comments and edit below.

Edit:

Here is a function which replaces the entire default palette with custom swatches.

Note, there are 7 colors in the list instead 8. That’s because there should be also the multiplication X (✕) at the end of the color list which removes any color applied to the text. So, when adding one more row there should be 15 colors, not 16.

function my_mce4_options($init) {

    $custom_colours="
        "3366FF", "Color 1 name",
        "CCFFCC", "Color 2 name",
        "FFFF00", "Color 3 name",
        "99CC00", "Color 4 name",
        "FF0000", "Color 5 name",
        "FF99CC", "Color 6 name",
        "CCFFFF", "Color 7 name"
    ";

    // build colour grid default+custom colors
    $init['textcolor_map'] = '['.$custom_colours.']';

    // change the number of rows in the grid if the number of colors changes
    // 8 swatches per row
    $init['textcolor_rows'] = 1;

    return $init;
}
add_filter('tiny_mce_before_init', 'my_mce4_options');

Also, you can build you own swatch grid depending on the color number and UI requrements:

$init['textcolor_rows'] = 4;
$init['textcolor_cols'] = 2;

Largely based on this WPSE answer.

For more information and customization see this blog post.

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