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<?php
/**
 * Customize ACF color picker default swatches
 */
function klf_acf_input_admin_footer() { ?>

<script type="text/javascript">
	(function($) {
	
	acf.add_filter('color_picker_args', function( args, $field ){
	
	// add the hexadecimal codes here for the colors you want to appear as swatches
	args.palettes = ['#0066a8', '#939ea5', '#ff0000']
	
	// return colors
	return args;
	
	});
	
	})(jQuery);
</script>

<?php }

add_action('acf/input/admin_footer', 'klf_acf_input_admin_footer');